From 4d80343a574b4fe9a432930a2a801aacc7d3c944 Mon Sep 17 00:00:00 2001
From: ldXiao <xld704@gmail.com>
Date: Sun, 16 May 2021 11:17:01 -0400
Subject: [PATCH] test kit

---
 pa3-tests/README.md                           |   24 +
 pa3-tests/benchmarks/exp.py                   |   25 +
 pa3-tests/benchmarks/exp.py.ast.typed         |  562 ++++
 .../benchmarks/exp.py.ast.typed.s.result      |   43 +
 pa3-tests/benchmarks/prime.py                 |   30 +
 pa3-tests/benchmarks/prime.py.ast.typed       |  658 ++++
 .../benchmarks/prime.py.ast.typed.s.result    |   15 +
 pa3-tests/benchmarks/sieve.py                 |  107 +
 pa3-tests/benchmarks/sieve.py.ast.typed       | 2816 +++++++++++++++++
 .../benchmarks/sieve.py.ast.typed.s.result    |   15 +
 pa3-tests/benchmarks/stdlib.py                |   77 +
 pa3-tests/benchmarks/stdlib.py.ast.typed      | 1813 +++++++++++
 .../benchmarks/stdlib.py.ast.typed.s.result   |   21 +
 pa3-tests/benchmarks/tree.py                  |   83 +
 pa3-tests/benchmarks/tree.py.ast.typed        | 2301 ++++++++++++++
 .../benchmarks/tree.py.ast.typed.s.result     |    4 +
 pa3-tests/chocopy-ref.jar                     |  Bin 0 -> 144814 bytes
 pa3-tests/core/call.py                        |   17 +
 pa3-tests/core/call.py.ast.typed              |  386 +++
 pa3-tests/core/call.py.ast.typed.s.result     |    7 +
 pa3-tests/core/call_with_args.py              |   19 +
 pa3-tests/core/call_with_args.py.ast.typed    |  554 ++++
 .../core/call_with_args.py.ast.typed.s.result |    9 +
 pa3-tests/core/error_div_zero.py              |    1 +
 pa3-tests/core/error_div_zero.py.ast.typed    |   65 +
 .../core/error_div_zero.py.ast.typed.s.result |    2 +
 pa3-tests/core/error_invalid_print.py         |    1 +
 .../core/error_invalid_print.py.ast.typed     |   46 +
 .../error_invalid_print.py.ast.typed.s.result |    2 +
 pa3-tests/core/error_mod_zero.py              |    1 +
 pa3-tests/core/error_mod_zero.py.ast.typed    |   65 +
 .../core/error_mod_zero.py.ast.typed.s.result |    2 +
 pa3-tests/core/expr_if.py                     |    2 +
 pa3-tests/core/expr_if.py.ast.typed           |  135 +
 pa3-tests/core/expr_if.py.ast.typed.s.result  |    2 +
 pa3-tests/core/id_global.py                   |    2 +
 pa3-tests/core/id_global.py.ast.typed         |   73 +
 .../core/id_global.py.ast.typed.s.result      |    1 +
 pa3-tests/core/id_local.py                    |    5 +
 pa3-tests/core/id_local.py.ast.typed          |  114 +
 pa3-tests/core/id_local.py.ast.typed.s.result |    1 +
 pa3-tests/core/input.py                       |    8 +
 pa3-tests/core/input.py.ast.in                |    4 +
 pa3-tests/core/input.py.ast.typed             |  196 ++
 pa3-tests/core/input.py.ast.typed.in          |    4 +
 pa3-tests/core/input.py.ast.typed.s.result    |    8 +
 pa3-tests/core/input.py.in                    |    4 +
 pa3-tests/core/len_invalid_1.py               |    3 +
 pa3-tests/core/len_invalid_1.py.ast.typed     |  103 +
 .../core/len_invalid_1.py.ast.typed.s.result  |    2 +
 pa3-tests/core/len_invalid_2.py               |    3 +
 pa3-tests/core/len_invalid_2.py.ast.typed     |   97 +
 .../core/len_invalid_2.py.ast.typed.s.result  |    2 +
 pa3-tests/core/list_concat.py                 |   12 +
 pa3-tests/core/list_concat.py.ast.typed       |  437 +++
 .../core/list_concat.py.ast.typed.s.result    |    6 +
 pa3-tests/core/list_concat_2.py               |    8 +
 pa3-tests/core/list_concat_2.py.ast.typed     |  366 +++
 .../core/list_concat_2.py.ast.typed.s.result  |    9 +
 pa3-tests/core/list_concat_none.py            |    4 +
 pa3-tests/core/list_concat_none.py.ast.typed  |  156 +
 .../list_concat_none.py.ast.typed.s.result    |    2 +
 pa3-tests/core/list_get_element.py            |    6 +
 pa3-tests/core/list_get_element.py.ast.typed  |  259 ++
 .../list_get_element.py.ast.typed.s.result    |    3 +
 pa3-tests/core/list_get_element_complex.py    |   11 +
 .../list_get_element_complex.py.ast.typed     |  313 ++
 ..._get_element_complex.py.ast.typed.s.result |    1 +
 pa3-tests/core/list_get_element_none.py       |    3 +
 .../core/list_get_element_none.py.ast.typed   |   96 +
 ...ist_get_element_none.py.ast.typed.s.result |    2 +
 pa3-tests/core/list_get_element_oob_1.py      |    4 +
 .../core/list_get_element_oob_1.py.ast.typed  |  156 +
 ...st_get_element_oob_1.py.ast.typed.s.result |    2 +
 pa3-tests/core/list_get_element_oob_2.py      |    4 +
 .../core/list_get_element_oob_2.py.ast.typed  |  147 +
 ...st_get_element_oob_2.py.ast.typed.s.result |    2 +
 pa3-tests/core/list_get_element_oob_3.py      |    4 +
 .../core/list_get_element_oob_3.py.ast.typed  |  120 +
 ...st_get_element_oob_3.py.ast.typed.s.result |    2 +
 pa3-tests/core/list_len.py                    |    4 +
 pa3-tests/core/list_len.py.ast.typed          |  154 +
 pa3-tests/core/list_len.py.ast.typed.s.result |    1 +
 pa3-tests/core/list_len_empty.py              |    4 +
 pa3-tests/core/list_len_empty.py.ast.typed    |  127 +
 .../core/list_len_empty.py.ast.typed.s.result |    1 +
 pa3-tests/core/list_set_element.py            |    9 +
 pa3-tests/core/list_set_element.py.ast.typed  |  382 +++
 .../list_set_element.py.ast.typed.s.result    |    3 +
 pa3-tests/core/list_set_element_none.py       |    4 +
 .../core/list_set_element_none.py.ast.typed   |   81 +
 ...ist_set_element_none.py.ast.typed.s.result |    2 +
 pa3-tests/core/list_set_element_oob_1.py      |    7 +
 .../core/list_set_element_oob_1.py.ast.typed  |  309 ++
 ...st_set_element_oob_1.py.ast.typed.s.result |    2 +
 pa3-tests/core/list_set_element_oob_2.py      |    7 +
 .../core/list_set_element_oob_2.py.ast.typed  |  300 ++
 ...st_set_element_oob_2.py.ast.typed.s.result |    2 +
 pa3-tests/core/list_set_element_oob_3.py      |    4 +
 .../core/list_set_element_oob_3.py.ast.typed  |  105 +
 ...st_set_element_oob_3.py.ast.typed.s.result |    2 +
 pa3-tests/core/literal_bool.py                |    2 +
 pa3-tests/core/literal_bool.py.ast.typed      |   83 +
 .../core/literal_bool.py.ast.typed.s.result   |    2 +
 pa3-tests/core/literal_int.py                 |    2 +
 pa3-tests/core/literal_int.py.ast.typed       |   83 +
 .../core/literal_int.py.ast.typed.s.result    |    2 +
 pa3-tests/core/literal_str.py                 |    1 +
 pa3-tests/core/literal_str.py.ast.typed       |   47 +
 .../core/literal_str.py.ast.typed.s.result    |    1 +
 pa3-tests/core/nested.py                      |   11 +
 pa3-tests/core/nested.py.ast.typed            |  272 ++
 pa3-tests/core/nested.py.ast.typed.s.result   |    1 +
 pa3-tests/core/nested2.py                     |   14 +
 pa3-tests/core/nested2.py.ast.typed           |  337 ++
 pa3-tests/core/nested2.py.ast.typed.s.result  |    1 +
 pa3-tests/core/object_attr_get.py             |   16 +
 pa3-tests/core/object_attr_get.py.ast.typed   |  387 +++
 .../object_attr_get.py.ast.typed.s.result     |    4 +
 pa3-tests/core/object_attr_get_none.py        |   16 +
 .../core/object_attr_get_none.py.ast.typed    |  379 +++
 ...object_attr_get_none.py.ast.typed.s.result |    4 +
 pa3-tests/core/object_attr_set.py             |   18 +
 pa3-tests/core/object_attr_set.py.ast.typed   |  455 +++
 .../object_attr_set.py.ast.typed.s.result     |    4 +
 pa3-tests/core/object_attr_set_eval_order.py  |   33 +
 .../object_attr_set_eval_order.py.ast.typed   |  771 +++++
 ..._attr_set_eval_order.py.ast.typed.s.result |   10 +
 pa3-tests/core/object_attr_set_none.py        |   19 +
 .../core/object_attr_set_none.py.ast.typed    |  447 +++
 ...object_attr_set_none.py.ast.typed.s.result |    4 +
 pa3-tests/core/object_init.py                 |   11 +
 pa3-tests/core/object_init.py.ast.typed       |  173 +
 .../core/object_init.py.ast.typed.s.result    |    1 +
 pa3-tests/core/object_method.py               |   16 +
 pa3-tests/core/object_method.py.ast.typed     |  387 +++
 .../core/object_method.py.ast.typed.s.result  |    2 +
 pa3-tests/core/object_method_complex_call.py  |   19 +
 .../object_method_complex_call.py.ast.typed   |  492 +++
 ..._method_complex_call.py.ast.typed.s.result |    3 +
 pa3-tests/core/object_method_nested.py        |   18 +
 .../core/object_method_nested.py.ast.typed    |  439 +++
 ...object_method_nested.py.ast.typed.s.result |    2 +
 pa3-tests/core/object_method_none.py          |   17 +
 .../core/object_method_none.py.ast.typed      |  412 +++
 .../object_method_none.py.ast.typed.s.result  |    3 +
 pa3-tests/core/object_method_override.py      |   19 +
 .../core/object_method_override.py.ast.typed  |  441 +++
 ...ject_method_override.py.ast.typed.s.result |    2 +
 pa3-tests/core/op_add.py                      |    1 +
 pa3-tests/core/op_add.py.ast.typed            |   65 +
 pa3-tests/core/op_add.py.ast.typed.s.result   |    1 +
 pa3-tests/core/op_cmp_bool.py                 |    8 +
 pa3-tests/core/op_cmp_bool.py.ast.typed       |  443 +++
 .../core/op_cmp_bool.py.ast.typed.s.result    |    8 +
 pa3-tests/core/op_cmp_int.py                  |   16 +
 pa3-tests/core/op_cmp_int.py.ast.typed        |  711 +++++
 .../core/op_cmp_int.py.ast.typed.s.result     |   12 +
 pa3-tests/core/op_div_mod.py                  |    5 +
 pa3-tests/core/op_div_mod.py.ast.typed        |  171 +
 .../core/op_div_mod.py.ast.typed.s.result     |    2 +
 pa3-tests/core/op_is.py                       |   19 +
 pa3-tests/core/op_is.py.ast.typed             |  598 ++++
 pa3-tests/core/op_is.py.ast.typed.s.result    |    7 +
 pa3-tests/core/op_logical.py                  |   13 +
 pa3-tests/core/op_logical.py.ast.typed        |  411 +++
 .../core/op_logical.py.ast.typed.s.result     |    6 +
 pa3-tests/core/op_mul.py                      |    1 +
 pa3-tests/core/op_mul.py.ast.typed            |   83 +
 pa3-tests/core/op_mul.py.ast.typed.s.result   |    1 +
 pa3-tests/core/op_negate.py                   |    2 +
 pa3-tests/core/op_negate.py.ast.typed         |   82 +
 .../core/op_negate.py.ast.typed.s.result      |    1 +
 pa3-tests/core/op_sub.py                      |    1 +
 pa3-tests/core/op_sub.py.ast.typed            |   65 +
 pa3-tests/core/op_sub.py.ast.typed.s.result   |    1 +
 pa3-tests/core/pass.py                        |    1 +
 pa3-tests/core/pass.py.ast.typed              |   11 +
 pa3-tests/core/pass.py.ast.typed.s.result     |    0
 pa3-tests/core/predef_constructors.py         |    4 +
 .../core/predef_constructors.py.ast.typed     |  192 ++
 .../predef_constructors.py.ast.typed.s.result |    4 +
 pa3-tests/core/stmt_for_list.py               |    7 +
 pa3-tests/core/stmt_for_list.py.ast.typed     |  178 ++
 .../core/stmt_for_list.py.ast.typed.s.result  |    3 +
 pa3-tests/core/stmt_for_list_empty.py         |   12 +
 .../core/stmt_for_list_empty.py.ast.typed     |  318 ++
 .../stmt_for_list_empty.py.ast.typed.s.result |    3 +
 pa3-tests/core/stmt_for_list_eval.py          |    8 +
 .../core/stmt_for_list_eval.py.ast.typed      |  202 ++
 .../stmt_for_list_eval.py.ast.typed.s.result  |    3 +
 pa3-tests/core/stmt_for_list_modify.py        |    8 +
 .../core/stmt_for_list_modify.py.ast.typed    |  219 ++
 ...stmt_for_list_modify.py.ast.typed.s.result |    3 +
 pa3-tests/core/stmt_for_list_nested.py        |    9 +
 .../core/stmt_for_list_nested.py.ast.typed    |  247 ++
 ...stmt_for_list_nested.py.ast.typed.s.result |    9 +
 .../core/stmt_for_list_nested_same_var.py     |    9 +
 ...stmt_for_list_nested_same_var.py.ast.typed |  229 ++
 ...list_nested_same_var.py.ast.typed.s.result |    9 +
 pa3-tests/core/stmt_for_list_none.py          |    5 +
 .../core/stmt_for_list_none.py.ast.typed      |  127 +
 .../stmt_for_list_none.py.ast.typed.s.result  |    2 +
 pa3-tests/core/stmt_for_list_nonlocal.py      |   15 +
 .../core/stmt_for_list_nonlocal.py.ast.typed  |  408 +++
 ...mt_for_list_nonlocal.py.ast.typed.s.result |    1 +
 pa3-tests/core/stmt_for_list_return.py        |    8 +
 .../core/stmt_for_list_return.py.ast.typed    |  241 ++
 ...stmt_for_list_return.py.ast.typed.s.result |    3 +
 pa3-tests/core/stmt_for_str.py                |    5 +
 pa3-tests/core/stmt_for_str.py.ast.typed      |  121 +
 .../core/stmt_for_str.py.ast.typed.s.result   |    3 +
 pa3-tests/core/stmt_for_str_empty.py          |    8 +
 .../core/stmt_for_str_empty.py.ast.typed      |  205 ++
 .../stmt_for_str_empty.py.ast.typed.s.result  |    3 +
 pa3-tests/core/stmt_for_str_eval.py           |    6 +
 pa3-tests/core/stmt_for_str_eval.py.ast.typed |  142 +
 .../stmt_for_str_eval.py.ast.typed.s.result   |    3 +
 pa3-tests/core/stmt_for_str_nested.py         |    8 +
 .../core/stmt_for_str_nested.py.ast.typed     |  205 ++
 .../stmt_for_str_nested.py.ast.typed.s.result |   12 +
 pa3-tests/core/stmt_for_str_same_var.py       |    4 +
 .../core/stmt_for_str_same_var.py.ast.typed   |   95 +
 ...tmt_for_str_same_var.py.ast.typed.s.result |    3 +
 pa3-tests/core/stmt_if.py                     |    7 +
 pa3-tests/core/stmt_if.py.ast.typed           |  125 +
 pa3-tests/core/stmt_if.py.ast.typed.s.result  |    1 +
 pa3-tests/core/stmt_return_early.py           |    6 +
 pa3-tests/core/stmt_return_early.py.ast.typed |  113 +
 .../stmt_return_early.py.ast.typed.s.result   |    1 +
 pa3-tests/core/stmt_while.py                  |    4 +
 pa3-tests/core/stmt_while.py.ast.typed        |  143 +
 .../core/stmt_while.py.ast.typed.s.result     |    9 +
 pa3-tests/core/str_cat.py                     |   17 +
 pa3-tests/core/str_cat.py.ast.typed           |  738 +++++
 pa3-tests/core/str_cat.py.ast.typed.s.result  |    6 +
 pa3-tests/core/str_cat_2.py                   |   19 +
 pa3-tests/core/str_cat_2.py.ast.typed         |  638 ++++
 .../core/str_cat_2.py.ast.typed.s.result      |    3 +
 pa3-tests/core/str_cmp.py                     |   17 +
 pa3-tests/core/str_cmp.py.ast.typed           |  659 ++++
 pa3-tests/core/str_cmp.py.ast.typed.s.result  |    6 +
 pa3-tests/core/str_get_element.py             |   14 +
 pa3-tests/core/str_get_element.py.ast.typed   |  462 +++
 .../str_get_element.py.ast.typed.s.result     |    3 +
 pa3-tests/core/str_get_element_oob_1.py       |    8 +
 .../core/str_get_element_oob_1.py.ast.typed   |  235 ++
 ...tr_get_element_oob_1.py.ast.typed.s.result |    2 +
 pa3-tests/core/str_get_element_oob_2.py       |    8 +
 .../core/str_get_element_oob_2.py.ast.typed   |  226 ++
 ...tr_get_element_oob_2.py.ast.typed.s.result |    2 +
 pa3-tests/core/str_get_element_oob_3.py       |    8 +
 .../core/str_get_element_oob_3.py.ast.typed   |  226 ++
 ...tr_get_element_oob_3.py.ast.typed.s.result |    2 +
 pa3-tests/core/str_len.py                     |    1 +
 pa3-tests/core/str_len.py.ast.typed           |   71 +
 pa3-tests/core/str_len.py.ast.typed.s.result  |    1 +
 pa3-tests/core/var_assign.py                  |    4 +
 pa3-tests/core/var_assign.py.ast.typed        |  128 +
 .../core/var_assign.py.ast.typed.s.result     |    1 +
 pa3-tests/run-tests.sh                        |   18 +
 261 files changed, 30055 insertions(+)
 create mode 100644 pa3-tests/README.md
 create mode 100644 pa3-tests/benchmarks/exp.py
 create mode 100644 pa3-tests/benchmarks/exp.py.ast.typed
 create mode 100644 pa3-tests/benchmarks/exp.py.ast.typed.s.result
 create mode 100644 pa3-tests/benchmarks/prime.py
 create mode 100644 pa3-tests/benchmarks/prime.py.ast.typed
 create mode 100644 pa3-tests/benchmarks/prime.py.ast.typed.s.result
 create mode 100644 pa3-tests/benchmarks/sieve.py
 create mode 100644 pa3-tests/benchmarks/sieve.py.ast.typed
 create mode 100644 pa3-tests/benchmarks/sieve.py.ast.typed.s.result
 create mode 100644 pa3-tests/benchmarks/stdlib.py
 create mode 100644 pa3-tests/benchmarks/stdlib.py.ast.typed
 create mode 100644 pa3-tests/benchmarks/stdlib.py.ast.typed.s.result
 create mode 100644 pa3-tests/benchmarks/tree.py
 create mode 100644 pa3-tests/benchmarks/tree.py.ast.typed
 create mode 100644 pa3-tests/benchmarks/tree.py.ast.typed.s.result
 create mode 100644 pa3-tests/chocopy-ref.jar
 create mode 100644 pa3-tests/core/call.py
 create mode 100644 pa3-tests/core/call.py.ast.typed
 create mode 100644 pa3-tests/core/call.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/call_with_args.py
 create mode 100644 pa3-tests/core/call_with_args.py.ast.typed
 create mode 100644 pa3-tests/core/call_with_args.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/error_div_zero.py
 create mode 100644 pa3-tests/core/error_div_zero.py.ast.typed
 create mode 100644 pa3-tests/core/error_div_zero.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/error_invalid_print.py
 create mode 100644 pa3-tests/core/error_invalid_print.py.ast.typed
 create mode 100644 pa3-tests/core/error_invalid_print.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/error_mod_zero.py
 create mode 100644 pa3-tests/core/error_mod_zero.py.ast.typed
 create mode 100644 pa3-tests/core/error_mod_zero.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/expr_if.py
 create mode 100644 pa3-tests/core/expr_if.py.ast.typed
 create mode 100644 pa3-tests/core/expr_if.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/id_global.py
 create mode 100644 pa3-tests/core/id_global.py.ast.typed
 create mode 100644 pa3-tests/core/id_global.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/id_local.py
 create mode 100644 pa3-tests/core/id_local.py.ast.typed
 create mode 100644 pa3-tests/core/id_local.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/input.py
 create mode 100644 pa3-tests/core/input.py.ast.in
 create mode 100644 pa3-tests/core/input.py.ast.typed
 create mode 100644 pa3-tests/core/input.py.ast.typed.in
 create mode 100644 pa3-tests/core/input.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/input.py.in
 create mode 100644 pa3-tests/core/len_invalid_1.py
 create mode 100644 pa3-tests/core/len_invalid_1.py.ast.typed
 create mode 100644 pa3-tests/core/len_invalid_1.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/len_invalid_2.py
 create mode 100644 pa3-tests/core/len_invalid_2.py.ast.typed
 create mode 100644 pa3-tests/core/len_invalid_2.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/list_concat.py
 create mode 100644 pa3-tests/core/list_concat.py.ast.typed
 create mode 100644 pa3-tests/core/list_concat.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/list_concat_2.py
 create mode 100644 pa3-tests/core/list_concat_2.py.ast.typed
 create mode 100644 pa3-tests/core/list_concat_2.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/list_concat_none.py
 create mode 100644 pa3-tests/core/list_concat_none.py.ast.typed
 create mode 100644 pa3-tests/core/list_concat_none.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/list_get_element.py
 create mode 100644 pa3-tests/core/list_get_element.py.ast.typed
 create mode 100644 pa3-tests/core/list_get_element.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/list_get_element_complex.py
 create mode 100644 pa3-tests/core/list_get_element_complex.py.ast.typed
 create mode 100644 pa3-tests/core/list_get_element_complex.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/list_get_element_none.py
 create mode 100644 pa3-tests/core/list_get_element_none.py.ast.typed
 create mode 100644 pa3-tests/core/list_get_element_none.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/list_get_element_oob_1.py
 create mode 100644 pa3-tests/core/list_get_element_oob_1.py.ast.typed
 create mode 100644 pa3-tests/core/list_get_element_oob_1.py.ast.typed.s.result
 create mode 100644 pa3-tests/core/list_get_element_oob_2.py
 create mode 100644 pa3-tests/core/list_get_element_oob_2.py.ast.typed
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diff --git a/pa3-tests/README.md b/pa3-tests/README.md
new file mode 100644
index 0000000..1e320cd
--- /dev/null
+++ b/pa3-tests/README.md
@@ -0,0 +1,24 @@
+# Tests for PA3: ChocoPy Code Generation
+
+Clone a student repository:
+```
+TEAM="team"
+git clone --branch=pa3final \
+    https://github.com/nyu-compiler-construction/pa3-chocopy-code-generation-${TEAM}
+```
+
+Build it:
+```
+cd pa3-chocopy-code-generation-${TEAM}
+mvn clean package
+```
+
+Clone the tests _into_ the student repository:
+```
+git clone https://github.com/nyu-compiler-construction/pa3-tests
+```
+
+Run the tests:
+```
+./pa3-tests/run-tests.sh 
+```
diff --git a/pa3-tests/benchmarks/exp.py b/pa3-tests/benchmarks/exp.py
new file mode 100644
index 0000000..3915517
--- /dev/null
+++ b/pa3-tests/benchmarks/exp.py
@@ -0,0 +1,25 @@
+# Compute x**y
+def exp(x: int, y: int) -> int:
+	a: int = 0
+	def f(i: int) -> int:
+		nonlocal a
+		def geta() -> int:
+			return a
+		if i <= 0:
+			return geta()
+		else:
+			a = a * x
+			return f(i-1)
+	a = 1
+	return f(y)
+
+# Input parameter
+n:int = 42
+
+# Run [0, n]
+i:int = 0
+
+# Crunch
+while i <= n:
+	print(exp(2, i % 31))
+	i = i + 1
\ No newline at end of file
diff --git a/pa3-tests/benchmarks/exp.py.ast.typed b/pa3-tests/benchmarks/exp.py.ast.typed
new file mode 100644
index 0000000..39a7fa1
--- /dev/null
+++ b/pa3-tests/benchmarks/exp.py.ast.typed
@@ -0,0 +1,562 @@
+{
+  "kind" : "Program",
+  "location" : [ 2, 1, 26, 1 ],
+  "declarations" : [ {
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+    "location" : [ 2, 1, 14, 13 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 2, 5, 2, 7 ],
+      "name" : "exp"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 2, 9, 2, 14 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 9, 2, 9 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 12, 2, 14 ],
+        "className" : "int"
+      }
+    }, {
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+      "location" : [ 2, 17, 2, 22 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 17, 2, 17 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 20, 2, 22 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
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+      "className" : "int"
+    },
+    "declarations" : [ {
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+      "location" : [ 3, 2, 3, 11 ],
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+        "location" : [ 3, 2, 3, 7 ],
+        "identifier" : {
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+          "location" : [ 3, 2, 3, 2 ],
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+        },
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+          "location" : [ 3, 5, 3, 7 ],
+          "className" : "int"
+        }
+      },
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+        "location" : [ 3, 11, 3, 11 ],
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+            "className" : "bool"
+          },
+          "left" : {
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+            "location" : [ 8, 6, 8, 6 ],
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+              "kind" : "ClassValueType",
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+            },
+            "name" : "i"
+          },
+          "operator" : "<=",
+          "right" : {
+            "kind" : "IntegerLiteral",
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+            "inferredType" : {
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+            },
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+          }
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+        "thenBody" : [ {
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diff --git a/pa3-tests/benchmarks/exp.py.ast.typed.s.result b/pa3-tests/benchmarks/exp.py.ast.typed.s.result
new file mode 100644
index 0000000..6bce2e5
--- /dev/null
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diff --git a/pa3-tests/benchmarks/prime.py b/pa3-tests/benchmarks/prime.py
new file mode 100644
index 0000000..7568705
--- /dev/null
+++ b/pa3-tests/benchmarks/prime.py
@@ -0,0 +1,30 @@
+# Get the n-th prime starting from 2
+def get_prime(n:int) -> int:
+    candidate:int = 2
+    found:int = 0
+    while True:
+        if is_prime(candidate):
+            found = found + 1
+            if found == n:
+                return candidate
+        candidate = candidate + 1
+    return 0 # Never happens
+
+def is_prime(x:int) -> bool:
+    div:int = 2
+    while div < x:
+        if x % div == 0:
+            return False
+        div = div + 1
+    return True
+
+# Input parameter
+n:int = 15
+
+# Run [1, n]
+i:int = 1
+
+# Crunch
+while i <= n:
+    print(get_prime(i))
+    i = i + 1
diff --git a/pa3-tests/benchmarks/prime.py.ast.typed b/pa3-tests/benchmarks/prime.py.ast.typed
new file mode 100644
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diff --git a/pa3-tests/benchmarks/prime.py.ast.typed.s.result b/pa3-tests/benchmarks/prime.py.ast.typed.s.result
new file mode 100644
index 0000000..6beaeaa
--- /dev/null
+++ b/pa3-tests/benchmarks/prime.py.ast.typed.s.result
@@ -0,0 +1,15 @@
+2
+3
+5
+7
+11
+13
+17
+19
+23
+29
+31
+37
+41
+43
+47
diff --git a/pa3-tests/benchmarks/sieve.py b/pa3-tests/benchmarks/sieve.py
new file mode 100644
index 0000000..b6aa977
--- /dev/null
+++ b/pa3-tests/benchmarks/sieve.py
@@ -0,0 +1,107 @@
+# A resizable list of integers
+class Vector(object):
+    items: [int] = None
+    size: int = 0
+
+    def __init__(self:"Vector"):
+        self.items = [0]
+
+    # Returns current capacity
+    def capacity(self:"Vector") -> int:
+        return len(self.items)
+
+    # Increases capacity of vector by one element
+    def increase_capacity(self:"Vector") -> int:
+        self.items = self.items + [0]
+        return self.capacity()
+
+    # Appends one item to end of vector
+    def append(self:"Vector", item: int) -> object:
+        if self.size == self.capacity():
+            self.increase_capacity()
+
+        self.items[self.size] = item
+        self.size = self.size + 1
+
+    # Appends many items to end of vector
+    def append_all(self:"Vector", new_items: [int]) -> object:
+        item:int = 0
+        for item in new_items:
+            self.append(item)
+
+    # Removes an item from the middle of vector
+    def remove_at(self:"Vector", idx: int) -> object:
+        if idx < 0:
+            return
+
+        while idx < self.size - 1:
+            self.items[idx] = self.items[idx + 1]
+            idx = idx + 1
+
+        self.size = self.size - 1
+
+    # Retrieves an item at a given index
+    def get(self:"Vector", idx: int) -> int:
+        return self.items[idx]
+
+    # Retrieves the current size of the vector
+    def length(self:"Vector") -> int:
+        return self.size
+
+# A faster (but more memory-consuming) implementation of vector
+class DoublingVector(Vector):
+    doubling_limit:int = 1000
+
+    # Overriding to do fewer resizes
+    def increase_capacity(self:"DoublingVector") -> int:
+        if (self.capacity() <= self.doubling_limit // 2):
+            self.items = self.items + self.items
+        else:
+            # If doubling limit has been reached, fall back to
+            # standard capacity increases
+            self.items = self.items + [0]
+        return self.capacity()
+
+# Makes a vector in the range [i, j)
+def vrange(i:int, j:int) -> Vector:
+    v:Vector = None
+    v = DoublingVector()
+    
+    while i < j:
+        v.append(i)
+        i = i + 1
+
+    return v
+
+# Sieve of Eratosthenes (not really)
+def sieve(v:Vector) -> object:
+    i:int = 0
+    j:int = 0
+    k:int = 0
+
+    while i < v.length():
+        k = v.get(i)
+        j = i + 1
+        while j < v.length():
+            if v.get(j) % k == 0:
+                v.remove_at(j)
+            else:
+                j = j + 1
+        i = i + 1
+
+# Input parameter
+n:int = 50
+
+# Data
+v:Vector = None
+i:int = 0
+
+# Crunch
+v = vrange(2, n)
+sieve(v)
+
+# Print
+while i < v.length():
+    print(v.get(i))
+    i = i + 1
+
diff --git a/pa3-tests/benchmarks/sieve.py.ast.typed b/pa3-tests/benchmarks/sieve.py.ast.typed
new file mode 100644
index 0000000..1c0eb6c
--- /dev/null
+++ b/pa3-tests/benchmarks/sieve.py.ast.typed
@@ -0,0 +1,2816 @@
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diff --git a/pa3-tests/benchmarks/sieve.py.ast.typed.s.result b/pa3-tests/benchmarks/sieve.py.ast.typed.s.result
new file mode 100644
index 0000000..6beaeaa
--- /dev/null
+++ b/pa3-tests/benchmarks/sieve.py.ast.typed.s.result
@@ -0,0 +1,15 @@
+2
+3
+5
+7
+11
+13
+17
+19
+23
+29
+31
+37
+41
+43
+47
diff --git a/pa3-tests/benchmarks/stdlib.py b/pa3-tests/benchmarks/stdlib.py
new file mode 100644
index 0000000..e7323bd
--- /dev/null
+++ b/pa3-tests/benchmarks/stdlib.py
@@ -0,0 +1,77 @@
+# ChocoPy library functions
+def int_to_str(x: int) -> str:
+    digits:[str] = None 
+    result:str = ""
+
+    # Set-up digit mapping
+    digits = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]
+
+    # Write sign if necessary
+    if x < 0:
+        result = "-"
+        x = -x
+
+    # Write digits using a recursive call
+    if x >= 10:
+        result = result + int_to_str(x // 10)
+    result = result + digits[x % 10]
+    return result
+
+def str_to_int(x: str) -> int:
+    result:int = 0
+    digit:int = 0
+    char:str = ""
+    sign:int = 1
+    first_char:bool = True
+
+    # Parse digits
+    for char in x:
+        if char == "-":
+            if not first_char:
+                return 0 # Error
+            sign = -1
+        elif char == "0":
+            digit = 0
+        elif char == "1":
+            digit = 1
+        elif char == "2":
+            digit = 2
+        elif char == "3":
+            digit = 3
+        elif char == "3":
+            digit = 3
+        elif char == "4":
+            digit = 4
+        elif char == "5":
+            digit = 5
+        elif char == "6":
+            digit = 6
+        elif char == "7":
+            digit = 7
+        elif char == "8":
+            digit = 8
+        elif char == "9":
+            digit = 9
+        else:
+            return 0 # On error
+        first_char = False
+        result = result * 10 + digit
+
+    # Compute result
+    return result * sign
+        
+# Input parameters
+c:int = 42
+n:int = 10
+
+# Run [-nc, nc] with step size c
+s:str = ""
+i:int = 0
+i = -n * c
+
+# Crunch
+while i <= n * c:
+    s = int_to_str(i)
+    print(s)
+    i = str_to_int(s) + c
+
diff --git a/pa3-tests/benchmarks/stdlib.py.ast.typed b/pa3-tests/benchmarks/stdlib.py.ast.typed
new file mode 100644
index 0000000..72079ff
--- /dev/null
+++ b/pa3-tests/benchmarks/stdlib.py.ast.typed
@@ -0,0 +1,1813 @@
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+      "name" : "int_to_str"
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+                                  "inferredType" : {
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+                              } ],
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+                                "value" : {
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+                                  "inferredType" : {
+                                    "kind" : "ClassValueType",
+                                    "className" : "int"
+                                  },
+                                  "value" : 0
+                                }
+                              } ]
+                            } ]
+                          } ]
+                        } ]
+                      } ]
+                    } ]
+                  } ]
+                } ]
+              } ]
+            } ]
+          } ]
+        } ]
+      }, {
+        "kind" : "AssignStmt",
+        "location" : [ 57, 9, 57, 26 ],
+        "targets" : [ {
+          "kind" : "Identifier",
+          "location" : [ 57, 9, 57, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "name" : "first_char"
+        } ],
+        "value" : {
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+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        }
+      }, {
+        "kind" : "AssignStmt",
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+        "targets" : [ {
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+        } ],
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+    }
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+}
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diff --git a/pa3-tests/benchmarks/stdlib.py.ast.typed.s.result b/pa3-tests/benchmarks/stdlib.py.ast.typed.s.result
new file mode 100644
index 0000000..3a07fa4
--- /dev/null
+++ b/pa3-tests/benchmarks/stdlib.py.ast.typed.s.result
@@ -0,0 +1,21 @@
+-420
+-378
+-336
+-294
+-252
+-210
+-168
+-126
+-84
+-42
+0
+42
+84
+126
+168
+210
+252
+294
+336
+378
+420
diff --git a/pa3-tests/benchmarks/tree.py b/pa3-tests/benchmarks/tree.py
new file mode 100644
index 0000000..9f337fd
--- /dev/null
+++ b/pa3-tests/benchmarks/tree.py
@@ -0,0 +1,83 @@
+# Binary-search trees
+class TreeNode(object):
+	value:int = 0
+	left:"TreeNode" = None
+	right:"TreeNode" = None
+
+	def insert(self:"TreeNode", x:int) -> bool:
+		if x < self.value:
+			if self.left is None:
+				self.left = makeNode(x)
+				return True
+			else:
+				return self.left.insert(x)
+		elif x > self.value:
+			if self.right is None:
+				self.right = makeNode(x)
+				return True
+			else:
+				return self.right.insert(x)
+		return False
+
+	def contains(self:"TreeNode", x:int) -> bool:
+		if x < self.value:
+			if self.left is None:
+				return False
+			else:
+				return self.left.contains(x)
+		elif x > self.value:
+			if self.right is None:
+				return False
+			else:
+				return self.right.contains(x)
+		else:
+			return True
+
+class Tree(object):
+	root:TreeNode = None
+	size:int = 0
+
+	def insert(self:"Tree", x:int) -> object:
+		if self.root is None:
+			self.root = makeNode(x)
+			self.size = 1
+		else:
+			if self.root.insert(x):
+				self.size = self.size + 1
+
+	def contains(self:"Tree", x:int) -> bool:
+		if self.root is None:
+			return False
+		else:
+			return self.root.contains(x)
+
+def makeNode(x: int) -> TreeNode:
+	b:TreeNode = None
+	b = TreeNode()
+	b.value = x
+	return b
+
+
+# Input parameters
+n:int = 100
+c:int = 4
+
+# Data
+t:Tree = None
+i:int = 0
+k:int = 37813
+
+# Crunch
+t = Tree()
+while i < n:
+	t.insert(k)
+	k = (k * 37813) % 37831
+	if i % c != 0:
+		t.insert(i)
+	i = i + 1
+
+print(t.size)
+
+for i in [4, 8, 15, 16, 23, 42]:
+	if t.contains(i):
+		print(i)
diff --git a/pa3-tests/benchmarks/tree.py.ast.typed b/pa3-tests/benchmarks/tree.py.ast.typed
new file mode 100644
index 0000000..a8d3cb3
--- /dev/null
+++ b/pa3-tests/benchmarks/tree.py.ast.typed
@@ -0,0 +1,2301 @@
+{
+  "kind" : "Program",
+  "location" : [ 2, 1, 84, 2 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 2, 1, 36, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 2, 7, 2, 14 ],
+      "name" : "TreeNode"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 2, 16, 2, 21 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 3, 2, 3, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 3, 2, 3, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 2, 3, 6 ],
+          "name" : "value"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 3, 8, 3, 10 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 14, 3, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      }
+    }, {
+      "kind" : "VarDef",
+      "location" : [ 4, 2, 4, 23 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 4, 2, 4, 16 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 2, 4, 5 ],
+          "name" : "left"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 4, 7, 4, 16 ],
+          "className" : "TreeNode"
+        }
+      },
+      "value" : {
+        "kind" : "NoneLiteral",
+        "location" : [ 4, 20, 4, 23 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        }
+      }
+    }, {
+      "kind" : "VarDef",
+      "location" : [ 5, 2, 5, 24 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 5, 2, 5, 17 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 2, 5, 6 ],
+          "name" : "right"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 5, 8, 5, 17 ],
+          "className" : "TreeNode"
+        }
+      },
+      "value" : {
+        "kind" : "NoneLiteral",
+        "location" : [ 5, 21, 5, 24 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        }
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 7, 2, 20, 15 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 6, 7, 11 ],
+        "name" : "insert"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 7, 13, 7, 27 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 13, 7, 16 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 7, 18, 7, 27 ],
+          "className" : "TreeNode"
+        }
+      }, {
+        "kind" : "TypedVar",
+        "location" : [ 7, 30, 7, 34 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 30, 7, 30 ],
+          "name" : "x"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 7, 32, 7, 34 ],
+          "className" : "int"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 7, 40, 7, 43 ],
+        "className" : "bool"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "IfStmt",
+        "location" : [ 8, 3, 20, 2 ],
+        "condition" : {
+          "kind" : "BinaryExpr",
+          "location" : [ 8, 6, 8, 19 ],
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diff --git a/pa3-tests/core/call.py b/pa3-tests/core/call.py
new file mode 100644
index 0000000..6b9ba64
--- /dev/null
+++ b/pa3-tests/core/call.py
@@ -0,0 +1,17 @@
+def f() -> int:
+    print("start f")
+    g()
+    print("end f")
+    return 42
+
+    
+def g() -> object:
+    print("start g")
+    h()
+    print("end g")
+
+def h() -> object:
+    print("start h")
+    print("end h")
+
+print(f())
diff --git a/pa3-tests/core/call.py.ast.typed b/pa3-tests/core/call.py.ast.typed
new file mode 100644
index 0000000..dd6d3f1
--- /dev/null
+++ b/pa3-tests/core/call.py.ast.typed
@@ -0,0 +1,386 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 17, 11 ],
+  "declarations" : [ {
+    "kind" : "FuncDef",
+    "location" : [ 1, 1, 5, 14 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 5, 1, 5 ],
+      "name" : "f"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 1, 12, 1, 14 ],
+      "className" : "int"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 2, 5, 2, 20 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 2, 5, 2, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 2, 11, 2, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "start f"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 3, 5, 3, 7 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 3, 5, 3, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "object"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 5, 3, 5 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            }
+          },
+          "name" : "g"
+        },
+        "args" : [ ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 4, 5, 4, 18 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 4, 5, 4, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 5, 4, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 4, 11, 4, 17 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "end f"
+        } ]
+      }
+    }, {
+      "kind" : "ReturnStmt",
+      "location" : [ 5, 5, 5, 13 ],
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 5, 12, 5, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    } ]
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 8, 1, 11, 19 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 8, 5, 8, 5 ],
+      "name" : "g"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 8, 12, 8, 17 ],
+      "className" : "object"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 9, 5, 9, 20 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 9, 5, 9, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 9, 5, 9, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 9, 11, 9, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "start g"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 10, 5, 10, 7 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 10, 5, 10, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "object"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 10, 5, 10, 5 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            }
+          },
+          "name" : "h"
+        },
+        "args" : [ ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 11, 5, 11, 18 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 11, 5, 11, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 11, 5, 11, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 11, 11, 11, 17 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "end g"
+        } ]
+      }
+    } ]
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 13, 1, 15, 19 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 13, 5, 13, 5 ],
+      "name" : "h"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 13, 12, 13, 17 ],
+      "className" : "object"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 14, 5, 14, 20 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 14, 5, 14, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 14, 5, 14, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 14, 11, 14, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "start h"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 15, 5, 15, 18 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 15, 5, 15, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 15, 5, 15, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 15, 11, 15, 17 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "end h"
+        } ]
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 17, 1, 17, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 17, 1, 17, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 17, 1, 17, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 17, 7, 17, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 17, 7, 17, 7 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "f"
+        },
+        "args" : [ ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/call.py.ast.typed.s.result b/pa3-tests/core/call.py.ast.typed.s.result
new file mode 100644
index 0000000..ff1eea8
--- /dev/null
+++ b/pa3-tests/core/call.py.ast.typed.s.result
@@ -0,0 +1,7 @@
+start f
+start g
+start h
+end h
+end g
+end f
+42
diff --git a/pa3-tests/core/call_with_args.py b/pa3-tests/core/call_with_args.py
new file mode 100644
index 0000000..bc9b16a
--- /dev/null
+++ b/pa3-tests/core/call_with_args.py
@@ -0,0 +1,19 @@
+def f(x:int) -> int:
+    print("start f")
+    print(x)
+    g(1, x)
+    print("end f")
+    return x
+
+    
+def g(y:int, z:int) -> object:
+    print("start g")
+    print(y)
+    print(z)
+    h("h")
+    print("end g")
+
+def h(msg: str) -> object:
+    print(msg)
+
+print(f(4))
diff --git a/pa3-tests/core/call_with_args.py.ast.typed b/pa3-tests/core/call_with_args.py.ast.typed
new file mode 100644
index 0000000..0ff917c
--- /dev/null
+++ b/pa3-tests/core/call_with_args.py.ast.typed
@@ -0,0 +1,554 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 19, 12 ],
+  "declarations" : [ {
+    "kind" : "FuncDef",
+    "location" : [ 1, 1, 6, 13 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 5, 1, 5 ],
+      "name" : "f"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 1, 7, 1, 11 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 7, 1, 7 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 9, 1, 11 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 1, 17, 1, 19 ],
+      "className" : "int"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 2, 5, 2, 20 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 2, 5, 2, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 2, 11, 2, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "start f"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 3, 5, 3, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 3, 5, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 5, 3, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 3, 11, 3, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 4, 5, 4, 11 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 4, 5, 4, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "object"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 5, 4, 5 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }, {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            }
+          },
+          "name" : "g"
+        },
+        "args" : [ {
+          "kind" : "IntegerLiteral",
+          "location" : [ 4, 7, 4, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }, {
+          "kind" : "Identifier",
+          "location" : [ 4, 10, 4, 10 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 5, 5, 5, 18 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 5, 5, 5, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 5, 5, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 5, 11, 5, 17 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "end f"
+        } ]
+      }
+    }, {
+      "kind" : "ReturnStmt",
+      "location" : [ 6, 5, 6, 12 ],
+      "value" : {
+        "kind" : "Identifier",
+        "location" : [ 6, 12, 6, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      }
+    } ]
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 9, 1, 14, 19 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 9, 5, 9, 5 ],
+      "name" : "g"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 9, 7, 9, 11 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 9, 7, 9, 7 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 9, 9, 9, 11 ],
+        "className" : "int"
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 9, 14, 9, 18 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 9, 14, 9, 14 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 9, 16, 9, 18 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 9, 24, 9, 29 ],
+      "className" : "object"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 10, 5, 10, 20 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 10, 5, 10, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 10, 5, 10, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 10, 11, 10, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "start g"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 11, 5, 11, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 11, 5, 11, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 11, 5, 11, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 11, 11, 11, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "y"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 12, 5, 12, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 12, 5, 12, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 12, 5, 12, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 12, 11, 12, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "z"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 13, 5, 13, 10 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 13, 5, 13, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "object"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 13, 5, 13, 5 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            }
+          },
+          "name" : "h"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 13, 7, 13, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "h"
+        } ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 14, 5, 14, 18 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 14, 5, 14, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 14, 5, 14, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 14, 11, 14, 17 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "end g"
+        } ]
+      }
+    } ]
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 16, 1, 17, 15 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 16, 5, 16, 5 ],
+      "name" : "h"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 16, 7, 16, 14 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 16, 7, 16, 9 ],
+        "name" : "msg"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 16, 12, 16, 14 ],
+        "className" : "str"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 16, 20, 16, 25 ],
+      "className" : "object"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 17, 5, 17, 14 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 17, 5, 17, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 17, 5, 17, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 17, 11, 17, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "msg"
+        } ]
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 19, 1, 19, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 19, 1, 19, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 19, 1, 19, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 19, 7, 19, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 19, 7, 19, 7 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "f"
+        },
+        "args" : [ {
+          "kind" : "IntegerLiteral",
+          "location" : [ 19, 9, 19, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 4
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/call_with_args.py.ast.typed.s.result b/pa3-tests/core/call_with_args.py.ast.typed.s.result
new file mode 100644
index 0000000..816ee29
--- /dev/null
+++ b/pa3-tests/core/call_with_args.py.ast.typed.s.result
@@ -0,0 +1,9 @@
+start f
+4
+start g
+1
+4
+h
+end g
+end f
+4
diff --git a/pa3-tests/core/error_div_zero.py b/pa3-tests/core/error_div_zero.py
new file mode 100644
index 0000000..f4481c6
--- /dev/null
+++ b/pa3-tests/core/error_div_zero.py
@@ -0,0 +1 @@
+print(42 // 0)
diff --git a/pa3-tests/core/error_div_zero.py.ast.typed b/pa3-tests/core/error_div_zero.py.ast.typed
new file mode 100644
index 0000000..c498a39
--- /dev/null
+++ b/pa3-tests/core/error_div_zero.py.ast.typed
@@ -0,0 +1,65 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 15 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 14 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 1, 7, 1, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 7, 1, 8 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 42
+        },
+        "operator" : "//",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 13, 1, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 0
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/error_div_zero.py.ast.typed.s.result b/pa3-tests/core/error_div_zero.py.ast.typed.s.result
new file mode 100644
index 0000000..3233f6d
--- /dev/null
+++ b/pa3-tests/core/error_div_zero.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Division by zero
+Exited with error code 2
diff --git a/pa3-tests/core/error_invalid_print.py b/pa3-tests/core/error_invalid_print.py
new file mode 100644
index 0000000..ca057e5
--- /dev/null
+++ b/pa3-tests/core/error_invalid_print.py
@@ -0,0 +1 @@
+print(None)
diff --git a/pa3-tests/core/error_invalid_print.py.ast.typed b/pa3-tests/core/error_invalid_print.py.ast.typed
new file mode 100644
index 0000000..311e64a
--- /dev/null
+++ b/pa3-tests/core/error_invalid_print.py.ast.typed
@@ -0,0 +1,46 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 12 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "NoneLiteral",
+        "location" : [ 1, 7, 1, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/error_invalid_print.py.ast.typed.s.result b/pa3-tests/core/error_invalid_print.py.ast.typed.s.result
new file mode 100644
index 0000000..cfb08fa
--- /dev/null
+++ b/pa3-tests/core/error_invalid_print.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Invalid argument
+Exited with error code 1
diff --git a/pa3-tests/core/error_mod_zero.py b/pa3-tests/core/error_mod_zero.py
new file mode 100644
index 0000000..09cfbef
--- /dev/null
+++ b/pa3-tests/core/error_mod_zero.py
@@ -0,0 +1 @@
+print(42 % 0)
diff --git a/pa3-tests/core/error_mod_zero.py.ast.typed b/pa3-tests/core/error_mod_zero.py.ast.typed
new file mode 100644
index 0000000..371eb36
--- /dev/null
+++ b/pa3-tests/core/error_mod_zero.py.ast.typed
@@ -0,0 +1,65 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 14 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 1, 7, 1, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 7, 1, 8 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 42
+        },
+        "operator" : "%",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 12, 1, 12 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 0
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/error_mod_zero.py.ast.typed.s.result b/pa3-tests/core/error_mod_zero.py.ast.typed.s.result
new file mode 100644
index 0000000..3233f6d
--- /dev/null
+++ b/pa3-tests/core/error_mod_zero.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Division by zero
+Exited with error code 2
diff --git a/pa3-tests/core/expr_if.py b/pa3-tests/core/expr_if.py
new file mode 100644
index 0000000..e0f0764
--- /dev/null
+++ b/pa3-tests/core/expr_if.py
@@ -0,0 +1,2 @@
+print(3 if True else 4)
+print(3 if False else 4)
diff --git a/pa3-tests/core/expr_if.py.ast.typed b/pa3-tests/core/expr_if.py.ast.typed
new file mode 100644
index 0000000..3b06e26
--- /dev/null
+++ b/pa3-tests/core/expr_if.py.ast.typed
@@ -0,0 +1,135 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 2, 25 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 23 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 23 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IfExpr",
+        "location" : [ 1, 7, 1, 22 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "condition" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 1, 12, 1, 15 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        },
+        "thenExpr" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 7, 1, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 3
+        },
+        "elseExpr" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 22, 1, 22 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 4
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 2, 1, 2, 24 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 2, 1, 2, 24 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IfExpr",
+        "location" : [ 2, 7, 2, 23 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "condition" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 2, 12, 2, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        },
+        "thenExpr" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 2, 7, 2, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 3
+        },
+        "elseExpr" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 2, 23, 2, 23 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 4
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/expr_if.py.ast.typed.s.result b/pa3-tests/core/expr_if.py.ast.typed.s.result
new file mode 100644
index 0000000..b944734
--- /dev/null
+++ b/pa3-tests/core/expr_if.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+3
+4
diff --git a/pa3-tests/core/id_global.py b/pa3-tests/core/id_global.py
new file mode 100644
index 0000000..d72c7d2
--- /dev/null
+++ b/pa3-tests/core/id_global.py
@@ -0,0 +1,2 @@
+x:int = 42
+print(x)
diff --git a/pa3-tests/core/id_global.py.ast.typed b/pa3-tests/core/id_global.py.ast.typed
new file mode 100644
index 0000000..9605936
--- /dev/null
+++ b/pa3-tests/core/id_global.py.ast.typed
@@ -0,0 +1,73 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 2, 9 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 42
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 2, 1, 2, 8 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 2, 1, 2, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 2, 7, 2, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/id_global.py.ast.typed.s.result b/pa3-tests/core/id_global.py.ast.typed.s.result
new file mode 100644
index 0000000..d81cc07
--- /dev/null
+++ b/pa3-tests/core/id_global.py.ast.typed.s.result
@@ -0,0 +1 @@
+42
diff --git a/pa3-tests/core/id_local.py b/pa3-tests/core/id_local.py
new file mode 100644
index 0000000..ff6dec8
--- /dev/null
+++ b/pa3-tests/core/id_local.py
@@ -0,0 +1,5 @@
+def f() -> int:
+  x:int = 1
+  return x
+
+print(f())
diff --git a/pa3-tests/core/id_local.py.ast.typed b/pa3-tests/core/id_local.py.ast.typed
new file mode 100644
index 0000000..472aa17
--- /dev/null
+++ b/pa3-tests/core/id_local.py.ast.typed
@@ -0,0 +1,114 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 5, 11 ],
+  "declarations" : [ {
+    "kind" : "FuncDef",
+    "location" : [ 1, 1, 3, 11 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 5, 1, 5 ],
+      "name" : "f"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 1, 12, 1, 14 ],
+      "className" : "int"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 3, 2, 11 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 3, 2, 7 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 3, 2, 3 ],
+          "name" : "x"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 5, 2, 7 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 11, 2, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }
+    } ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 3, 3, 3, 10 ],
+      "value" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 10, 3, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 5, 1, 5, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 5, 1, 5, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 1, 5, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 5, 7, 5, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 7, 5, 7 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "f"
+        },
+        "args" : [ ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/id_local.py.ast.typed.s.result b/pa3-tests/core/id_local.py.ast.typed.s.result
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/pa3-tests/core/id_local.py.ast.typed.s.result
@@ -0,0 +1 @@
+1
diff --git a/pa3-tests/core/input.py b/pa3-tests/core/input.py
new file mode 100644
index 0000000..a47c902
--- /dev/null
+++ b/pa3-tests/core/input.py
@@ -0,0 +1,8 @@
+# Test of 'input' function.
+
+s: str = ""
+
+s = input()
+while len(s) > 0:
+    print(s)
+    s = input()
diff --git a/pa3-tests/core/input.py.ast.in b/pa3-tests/core/input.py.ast.in
new file mode 100644
index 0000000..2638e9f
--- /dev/null
+++ b/pa3-tests/core/input.py.ast.in
@@ -0,0 +1,4 @@
+First line.
+Next line is blank.
+
+Last line.
diff --git a/pa3-tests/core/input.py.ast.typed b/pa3-tests/core/input.py.ast.typed
new file mode 100644
index 0000000..edf0a5d
--- /dev/null
+++ b/pa3-tests/core/input.py.ast.typed
@@ -0,0 +1,196 @@
+{
+  "kind" : "Program",
+  "location" : [ 3, 1, 9, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 3, 1, 3, 11 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 3, 1, 3, 6 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "name" : "s"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 3, 4, 3, 6 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 3, 10, 3, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 5, 1, 5, 11 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 5, 1, 5, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "s"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 5, 5, 5, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 5, 5, 9 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }
+        },
+        "name" : "input"
+      },
+      "args" : [ ]
+    }
+  }, {
+    "kind" : "WhileStmt",
+    "location" : [ 6, 1, 9, 1 ],
+    "condition" : {
+      "kind" : "BinaryExpr",
+      "location" : [ 6, 7, 6, 16 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "bool"
+      },
+      "left" : {
+        "kind" : "CallExpr",
+        "location" : [ 6, 7, 6, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 7, 6, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 6, 11, 6, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "s"
+        } ]
+      },
+      "operator" : ">",
+      "right" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 6, 16, 6, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      }
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 7, 5, 7, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 7, 5, 7, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 5, 7, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 7, 11, 7, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "s"
+        } ]
+      }
+    }, {
+      "kind" : "AssignStmt",
+      "location" : [ 8, 5, 8, 15 ],
+      "targets" : [ {
+        "kind" : "Identifier",
+        "location" : [ 8, 5, 8, 5 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "s"
+      } ],
+      "value" : {
+        "kind" : "CallExpr",
+        "location" : [ 8, 9, 8, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 8, 9, 8, 13 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            }
+          },
+          "name" : "input"
+        },
+        "args" : [ ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/input.py.ast.typed.in b/pa3-tests/core/input.py.ast.typed.in
new file mode 100644
index 0000000..2638e9f
--- /dev/null
+++ b/pa3-tests/core/input.py.ast.typed.in
@@ -0,0 +1,4 @@
+First line.
+Next line is blank.
+
+Last line.
diff --git a/pa3-tests/core/input.py.ast.typed.s.result b/pa3-tests/core/input.py.ast.typed.s.result
new file mode 100644
index 0000000..86e7fe4
--- /dev/null
+++ b/pa3-tests/core/input.py.ast.typed.s.result
@@ -0,0 +1,8 @@
+First line.
+
+Next line is blank.
+
+
+
+Last line.
+
diff --git a/pa3-tests/core/input.py.in b/pa3-tests/core/input.py.in
new file mode 100644
index 0000000..2638e9f
--- /dev/null
+++ b/pa3-tests/core/input.py.in
@@ -0,0 +1,4 @@
+First line.
+Next line is blank.
+
+Last line.
diff --git a/pa3-tests/core/len_invalid_1.py b/pa3-tests/core/len_invalid_1.py
new file mode 100644
index 0000000..1dfa598
--- /dev/null
+++ b/pa3-tests/core/len_invalid_1.py
@@ -0,0 +1,3 @@
+x:[int] = None
+
+print(len(x))
diff --git a/pa3-tests/core/len_invalid_1.py.ast.typed b/pa3-tests/core/len_invalid_1.py.ast.typed
new file mode 100644
index 0000000..170d7ee
--- /dev/null
+++ b/pa3-tests/core/len_invalid_1.py.ast.typed
@@ -0,0 +1,103 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 3, 14 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 3, 1, 3, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 3, 1, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 3, 7, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 7, 3, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 3, 11, 3, 11 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/len_invalid_1.py.ast.typed.s.result b/pa3-tests/core/len_invalid_1.py.ast.typed.s.result
new file mode 100644
index 0000000..cfb08fa
--- /dev/null
+++ b/pa3-tests/core/len_invalid_1.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Invalid argument
+Exited with error code 1
diff --git a/pa3-tests/core/len_invalid_2.py b/pa3-tests/core/len_invalid_2.py
new file mode 100644
index 0000000..de46502
--- /dev/null
+++ b/pa3-tests/core/len_invalid_2.py
@@ -0,0 +1,3 @@
+x:int = 1
+
+print(len(x))
diff --git a/pa3-tests/core/len_invalid_2.py.ast.typed b/pa3-tests/core/len_invalid_2.py.ast.typed
new file mode 100644
index 0000000..afc264d
--- /dev/null
+++ b/pa3-tests/core/len_invalid_2.py.ast.typed
@@ -0,0 +1,97 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 3, 14 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 1
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 3, 1, 3, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 3, 1, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 3, 7, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 7, 3, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 3, 11, 3, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/len_invalid_2.py.ast.typed.s.result b/pa3-tests/core/len_invalid_2.py.ast.typed.s.result
new file mode 100644
index 0000000..cfb08fa
--- /dev/null
+++ b/pa3-tests/core/len_invalid_2.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Invalid argument
+Exited with error code 1
diff --git a/pa3-tests/core/list_concat.py b/pa3-tests/core/list_concat.py
new file mode 100644
index 0000000..d2ef21d
--- /dev/null
+++ b/pa3-tests/core/list_concat.py
@@ -0,0 +1,12 @@
+def concat(x:[int], y:[int]) -> [int]:
+    return x + y
+
+z:[int] = None
+i:int = 0
+
+z = concat([1,2,3], [4,5,6])
+
+while i < len(z):
+    print(z[i])
+    i = i + 1
+
diff --git a/pa3-tests/core/list_concat.py.ast.typed b/pa3-tests/core/list_concat.py.ast.typed
new file mode 100644
index 0000000..38ba198
--- /dev/null
+++ b/pa3-tests/core/list_concat.py.ast.typed
@@ -0,0 +1,437 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 13, 1 ],
+  "declarations" : [ {
+    "kind" : "FuncDef",
+    "location" : [ 1, 1, 2, 17 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 5, 1, 10 ],
+      "name" : "concat"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 1, 12, 1, 18 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 12, 1, 12 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 14, 1, 18 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 15, 1, 17 ],
+          "className" : "int"
+        }
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 1, 21, 1, 27 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 21, 1, 21 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 23, 1, 27 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 24, 1, 26 ],
+          "className" : "int"
+        }
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ListType",
+      "location" : [ 1, 33, 1, 37 ],
+      "elementType" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 34, 1, 36 ],
+        "className" : "int"
+      }
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 2, 5, 2, 16 ],
+      "value" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 2, 12, 2, 16 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "left" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 12, 2, 12 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 16, 2, 16 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "y"
+        }
+      }
+    } ]
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 4, 1, 4, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 4, 1, 4, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 4, 3, 4, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 4, 4, 4, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 4, 11, 4, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 5, 1, 5, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 5, 1, 5, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 1, 5, 1 ],
+        "name" : "i"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 5, 3, 5, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 5, 9, 5, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 7, 1, 7, 28 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 7, 1, 7, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 7, 5, 7, 28 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 5, 7, 10 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          }, {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          } ],
+          "returnType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          }
+        },
+        "name" : "concat"
+      },
+      "args" : [ {
+        "kind" : "ListExpr",
+        "location" : [ 7, 12, 7, 18 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "elements" : [ {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 13, 7, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 15, 7, 15 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 2
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 17, 7, 17 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 3
+        } ]
+      }, {
+        "kind" : "ListExpr",
+        "location" : [ 7, 21, 7, 27 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "elements" : [ {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 22, 7, 22 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 4
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 24, 7, 24 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 5
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 26, 7, 26 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 6
+        } ]
+      } ]
+    }
+  }, {
+    "kind" : "WhileStmt",
+    "location" : [ 9, 1, 13, 1 ],
+    "condition" : {
+      "kind" : "BinaryExpr",
+      "location" : [ 9, 7, 9, 16 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "bool"
+      },
+      "left" : {
+        "kind" : "Identifier",
+        "location" : [ 9, 7, 9, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "i"
+      },
+      "operator" : "<",
+      "right" : {
+        "kind" : "CallExpr",
+        "location" : [ 9, 11, 9, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 9, 11, 9, 13 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 9, 15, 9, 15 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "z"
+        } ]
+      }
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 10, 5, 10, 15 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 10, 5, 10, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 10, 5, 10, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "IndexExpr",
+          "location" : [ 10, 11, 10, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "list" : {
+            "kind" : "Identifier",
+            "location" : [ 10, 11, 10, 11 ],
+            "inferredType" : {
+              "kind" : "ListValueType",
+              "elementType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "z"
+          },
+          "index" : {
+            "kind" : "Identifier",
+            "location" : [ 10, 13, 10, 13 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "name" : "i"
+          }
+        } ]
+      }
+    }, {
+      "kind" : "AssignStmt",
+      "location" : [ 11, 5, 11, 13 ],
+      "targets" : [ {
+        "kind" : "Identifier",
+        "location" : [ 11, 5, 11, 5 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "i"
+      } ],
+      "value" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 11, 9, 11, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "Identifier",
+          "location" : [ 11, 9, 11, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "i"
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 11, 13, 11, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_concat.py.ast.typed.s.result b/pa3-tests/core/list_concat.py.ast.typed.s.result
new file mode 100644
index 0000000..b414108
--- /dev/null
+++ b/pa3-tests/core/list_concat.py.ast.typed.s.result
@@ -0,0 +1,6 @@
+1
+2
+3
+4
+5
+6
diff --git a/pa3-tests/core/list_concat_2.py b/pa3-tests/core/list_concat_2.py
new file mode 100644
index 0000000..ed0826c
--- /dev/null
+++ b/pa3-tests/core/list_concat_2.py
@@ -0,0 +1,8 @@
+z:[int] = None
+i:int = 0
+
+z = [1,2,3] + [4,5,6] + [7,8,9]
+
+while i < len(z):
+    print(z[i])
+    i = i + 1
diff --git a/pa3-tests/core/list_concat_2.py.ast.typed b/pa3-tests/core/list_concat_2.py.ast.typed
new file mode 100644
index 0000000..f5a28b0
--- /dev/null
+++ b/pa3-tests/core/list_concat_2.py.ast.typed
@@ -0,0 +1,366 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 9, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "i"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 2, 9, 2, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 4, 1, 4, 31 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 4, 1, 4, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    } ],
+    "value" : {
+      "kind" : "BinaryExpr",
+      "location" : [ 4, 5, 4, 31 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "left" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 4, 5, 4, 21 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "left" : {
+          "kind" : "ListExpr",
+          "location" : [ 4, 5, 4, 11 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "elements" : [ {
+            "kind" : "IntegerLiteral",
+            "location" : [ 4, 6, 4, 6 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 1
+          }, {
+            "kind" : "IntegerLiteral",
+            "location" : [ 4, 8, 4, 8 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 2
+          }, {
+            "kind" : "IntegerLiteral",
+            "location" : [ 4, 10, 4, 10 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 3
+          } ]
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "ListExpr",
+          "location" : [ 4, 15, 4, 21 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "elements" : [ {
+            "kind" : "IntegerLiteral",
+            "location" : [ 4, 16, 4, 16 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 4
+          }, {
+            "kind" : "IntegerLiteral",
+            "location" : [ 4, 18, 4, 18 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 5
+          }, {
+            "kind" : "IntegerLiteral",
+            "location" : [ 4, 20, 4, 20 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 6
+          } ]
+        }
+      },
+      "operator" : "+",
+      "right" : {
+        "kind" : "ListExpr",
+        "location" : [ 4, 25, 4, 31 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "elements" : [ {
+          "kind" : "IntegerLiteral",
+          "location" : [ 4, 26, 4, 26 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 7
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 4, 28, 4, 28 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 8
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 4, 30, 4, 30 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 9
+        } ]
+      }
+    }
+  }, {
+    "kind" : "WhileStmt",
+    "location" : [ 6, 1, 9, 1 ],
+    "condition" : {
+      "kind" : "BinaryExpr",
+      "location" : [ 6, 7, 6, 16 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "bool"
+      },
+      "left" : {
+        "kind" : "Identifier",
+        "location" : [ 6, 7, 6, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "i"
+      },
+      "operator" : "<",
+      "right" : {
+        "kind" : "CallExpr",
+        "location" : [ 6, 11, 6, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 11, 6, 13 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 6, 15, 6, 15 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "z"
+        } ]
+      }
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 7, 5, 7, 15 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 7, 5, 7, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 5, 7, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "IndexExpr",
+          "location" : [ 7, 11, 7, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "list" : {
+            "kind" : "Identifier",
+            "location" : [ 7, 11, 7, 11 ],
+            "inferredType" : {
+              "kind" : "ListValueType",
+              "elementType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "z"
+          },
+          "index" : {
+            "kind" : "Identifier",
+            "location" : [ 7, 13, 7, 13 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "name" : "i"
+          }
+        } ]
+      }
+    }, {
+      "kind" : "AssignStmt",
+      "location" : [ 8, 5, 8, 13 ],
+      "targets" : [ {
+        "kind" : "Identifier",
+        "location" : [ 8, 5, 8, 5 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "i"
+      } ],
+      "value" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 8, 9, 8, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "Identifier",
+          "location" : [ 8, 9, 8, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "i"
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 8, 13, 8, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_concat_2.py.ast.typed.s.result b/pa3-tests/core/list_concat_2.py.ast.typed.s.result
new file mode 100644
index 0000000..0719398
--- /dev/null
+++ b/pa3-tests/core/list_concat_2.py.ast.typed.s.result
@@ -0,0 +1,9 @@
+1
+2
+3
+4
+5
+6
+7
+8
+9
diff --git a/pa3-tests/core/list_concat_none.py b/pa3-tests/core/list_concat_none.py
new file mode 100644
index 0000000..ad0a310
--- /dev/null
+++ b/pa3-tests/core/list_concat_none.py
@@ -0,0 +1,4 @@
+x:[int] = None
+y:[int] = None
+
+print(len(x+y))
diff --git a/pa3-tests/core/list_concat_none.py.ast.typed b/pa3-tests/core/list_concat_none.py.ast.typed
new file mode 100644
index 0000000..5c50b2a
--- /dev/null
+++ b/pa3-tests/core/list_concat_none.py.ast.typed
@@ -0,0 +1,156 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 16 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 2, 3, 2, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 4, 2, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 2, 11, 2, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 15 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 15 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 4, 7, 4, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 7, 4, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "BinaryExpr",
+          "location" : [ 4, 11, 4, 13 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "left" : {
+            "kind" : "Identifier",
+            "location" : [ 4, 11, 4, 11 ],
+            "inferredType" : {
+              "kind" : "ListValueType",
+              "elementType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "x"
+          },
+          "operator" : "+",
+          "right" : {
+            "kind" : "Identifier",
+            "location" : [ 4, 13, 4, 13 ],
+            "inferredType" : {
+              "kind" : "ListValueType",
+              "elementType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "y"
+          }
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_concat_none.py.ast.typed.s.result b/pa3-tests/core/list_concat_none.py.ast.typed.s.result
new file mode 100644
index 0000000..ae52477
--- /dev/null
+++ b/pa3-tests/core/list_concat_none.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Operation on None
+Exited with error code 4
diff --git a/pa3-tests/core/list_get_element.py b/pa3-tests/core/list_get_element.py
new file mode 100644
index 0000000..54a3835
--- /dev/null
+++ b/pa3-tests/core/list_get_element.py
@@ -0,0 +1,6 @@
+x:[int] = None
+
+x = [1, 2, 3]
+print(x[0])
+print(x[1])
+print(x[2])
diff --git a/pa3-tests/core/list_get_element.py.ast.typed b/pa3-tests/core/list_get_element.py.ast.typed
new file mode 100644
index 0000000..71a94cb
--- /dev/null
+++ b/pa3-tests/core/list_get_element.py.ast.typed
@@ -0,0 +1,259 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 6, 12 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
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+      }
+    }
+  } ],
+  "statements" : [ {
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+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
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+        }
+      },
+      "elements" : [ {
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+        "location" : [ 3, 6, 3, 6 ],
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+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 9, 3, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 12, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 11 ],
+    "expr" : {
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+        "className" : "<None>"
+      },
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+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 4, 7, 4, 10 ],
+        "inferredType" : {
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+        },
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+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 4, 9, 4, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 0
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 5, 1, 5, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 5, 1, 5, 11 ],
+      "inferredType" : {
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+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 1, 5, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
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+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 5, 7, 5, 10 ],
+        "inferredType" : {
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+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 7, 5, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 5, 9, 5, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 6, 1, 6, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 6, 1, 6, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 6, 1, 6, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 6, 7, 6, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 7, 6, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 6, 9, 6, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 2
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_get_element.py.ast.typed.s.result b/pa3-tests/core/list_get_element.py.ast.typed.s.result
new file mode 100644
index 0000000..01e79c3
--- /dev/null
+++ b/pa3-tests/core/list_get_element.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+1
+2
+3
diff --git a/pa3-tests/core/list_get_element_complex.py b/pa3-tests/core/list_get_element_complex.py
new file mode 100644
index 0000000..fe03e8d
--- /dev/null
+++ b/pa3-tests/core/list_get_element_complex.py
@@ -0,0 +1,11 @@
+next:int = 0
+
+def next_int() -> int:
+    global next
+    next = next + 1
+    return next
+
+def make_list() -> [int]:
+    return [next_int(), next_int(), next_int()]
+
+print(make_list()[next_int() - 3])
diff --git a/pa3-tests/core/list_get_element_complex.py.ast.typed b/pa3-tests/core/list_get_element_complex.py.ast.typed
new file mode 100644
index 0000000..f3c48bb
--- /dev/null
+++ b/pa3-tests/core/list_get_element_complex.py.ast.typed
@@ -0,0 +1,313 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 11, 35 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 12 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 8 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 4 ],
+        "name" : "next"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 6, 1, 8 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 12, 1, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 3, 1, 6, 16 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 3, 5, 3, 12 ],
+      "name" : "next_int"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 3, 19, 3, 21 ],
+      "className" : "int"
+    },
+    "declarations" : [ {
+      "kind" : "GlobalDecl",
+      "location" : [ 4, 5, 4, 15 ],
+      "variable" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 12, 4, 15 ],
+        "name" : "next"
+      }
+    } ],
+    "statements" : [ {
+      "kind" : "AssignStmt",
+      "location" : [ 5, 5, 5, 19 ],
+      "targets" : [ {
+        "kind" : "Identifier",
+        "location" : [ 5, 5, 5, 8 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "next"
+      } ],
+      "value" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 5, 12, 5, 19 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 12, 5, 15 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "next"
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 5, 19, 5, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }
+      }
+    }, {
+      "kind" : "ReturnStmt",
+      "location" : [ 6, 5, 6, 15 ],
+      "value" : {
+        "kind" : "Identifier",
+        "location" : [ 6, 12, 6, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "next"
+      }
+    } ]
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 8, 1, 9, 48 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 8, 5, 8, 13 ],
+      "name" : "make_list"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ListType",
+      "location" : [ 8, 20, 8, 24 ],
+      "elementType" : {
+        "kind" : "ClassType",
+        "location" : [ 8, 21, 8, 23 ],
+        "className" : "int"
+      }
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 9, 5, 9, 47 ],
+      "value" : {
+        "kind" : "ListExpr",
+        "location" : [ 9, 12, 9, 47 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "elements" : [ {
+          "kind" : "CallExpr",
+          "location" : [ 9, 13, 9, 22 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 9, 13, 9, 20 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "next_int"
+          },
+          "args" : [ ]
+        }, {
+          "kind" : "CallExpr",
+          "location" : [ 9, 25, 9, 34 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 9, 25, 9, 32 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "next_int"
+          },
+          "args" : [ ]
+        }, {
+          "kind" : "CallExpr",
+          "location" : [ 9, 37, 9, 46 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 9, 37, 9, 44 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "next_int"
+          },
+          "args" : [ ]
+        } ]
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 11, 1, 11, 34 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 11, 1, 11, 34 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 1, 11, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 11, 7, 11, 33 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "CallExpr",
+          "location" : [ 11, 7, 11, 17 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 11, 7, 11, 15 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ ],
+              "returnType" : {
+                "kind" : "ListValueType",
+                "elementType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "int"
+                }
+              }
+            },
+            "name" : "make_list"
+          },
+          "args" : [ ]
+        },
+        "index" : {
+          "kind" : "BinaryExpr",
+          "location" : [ 11, 19, 11, 32 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "left" : {
+            "kind" : "CallExpr",
+            "location" : [ 11, 19, 11, 28 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "function" : {
+              "kind" : "Identifier",
+              "location" : [ 11, 19, 11, 26 ],
+              "inferredType" : {
+                "kind" : "FuncType",
+                "parameters" : [ ],
+                "returnType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "int"
+                }
+              },
+              "name" : "next_int"
+            },
+            "args" : [ ]
+          },
+          "operator" : "-",
+          "right" : {
+            "kind" : "IntegerLiteral",
+            "location" : [ 11, 32, 11, 32 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 3
+          }
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_get_element_complex.py.ast.typed.s.result b/pa3-tests/core/list_get_element_complex.py.ast.typed.s.result
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ b/pa3-tests/core/list_get_element_complex.py.ast.typed.s.result
@@ -0,0 +1 @@
+2
diff --git a/pa3-tests/core/list_get_element_none.py b/pa3-tests/core/list_get_element_none.py
new file mode 100644
index 0000000..871b395
--- /dev/null
+++ b/pa3-tests/core/list_get_element_none.py
@@ -0,0 +1,3 @@
+x:[int] = None
+
+print(x[0])
diff --git a/pa3-tests/core/list_get_element_none.py.ast.typed b/pa3-tests/core/list_get_element_none.py.ast.typed
new file mode 100644
index 0000000..a95c813
--- /dev/null
+++ b/pa3-tests/core/list_get_element_none.py.ast.typed
@@ -0,0 +1,96 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 3, 12 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 3, 1, 3, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 3, 1, 3, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 3, 7, 3, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 7, 3, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 3, 9, 3, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 0
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_get_element_none.py.ast.typed.s.result b/pa3-tests/core/list_get_element_none.py.ast.typed.s.result
new file mode 100644
index 0000000..ae52477
--- /dev/null
+++ b/pa3-tests/core/list_get_element_none.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Operation on None
+Exited with error code 4
diff --git a/pa3-tests/core/list_get_element_oob_1.py b/pa3-tests/core/list_get_element_oob_1.py
new file mode 100644
index 0000000..7b0e490
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_1.py
@@ -0,0 +1,4 @@
+x:[int] = None
+
+x = [1, 2, 3]
+print(x[-1])
diff --git a/pa3-tests/core/list_get_element_oob_1.py.ast.typed b/pa3-tests/core/list_get_element_oob_1.py.ast.typed
new file mode 100644
index 0000000..c5e9254
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_1.py.ast.typed
@@ -0,0 +1,156 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 13 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 3, 1, 3, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 6, 3, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 9, 3, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 12, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 12 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 4, 7, 4, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 7, 4, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "UnaryExpr",
+          "location" : [ 4, 9, 4, 10 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "operator" : "-",
+          "operand" : {
+            "kind" : "IntegerLiteral",
+            "location" : [ 4, 10, 4, 10 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 1
+          }
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_get_element_oob_1.py.ast.typed.s.result b/pa3-tests/core/list_get_element_oob_1.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_1.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/list_get_element_oob_2.py b/pa3-tests/core/list_get_element_oob_2.py
new file mode 100644
index 0000000..ba070b2
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_2.py
@@ -0,0 +1,4 @@
+x:[int] = None
+
+x = [1, 2, 3]
+print(x[3])
diff --git a/pa3-tests/core/list_get_element_oob_2.py.ast.typed b/pa3-tests/core/list_get_element_oob_2.py.ast.typed
new file mode 100644
index 0000000..070d13b
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_2.py.ast.typed
@@ -0,0 +1,147 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 12 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 3, 1, 3, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 6, 3, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 9, 3, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 12, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 4, 7, 4, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 7, 4, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 4, 9, 4, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 3
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_get_element_oob_2.py.ast.typed.s.result b/pa3-tests/core/list_get_element_oob_2.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_2.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/list_get_element_oob_3.py b/pa3-tests/core/list_get_element_oob_3.py
new file mode 100644
index 0000000..827aae5
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_3.py
@@ -0,0 +1,4 @@
+x:[int] = None
+
+x = []
+print(x[0])
diff --git a/pa3-tests/core/list_get_element_oob_3.py.ast.typed b/pa3-tests/core/list_get_element_oob_3.py.ast.typed
new file mode 100644
index 0000000..aaeb34f
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_3.py.ast.typed
@@ -0,0 +1,120 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 12 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 6 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 3, 1, 3, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 6 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<Empty>"
+      },
+      "elements" : [ ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 4, 7, 4, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 7, 4, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 4, 9, 4, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 0
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_get_element_oob_3.py.ast.typed.s.result b/pa3-tests/core/list_get_element_oob_3.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/list_get_element_oob_3.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/list_len.py b/pa3-tests/core/list_len.py
new file mode 100644
index 0000000..95ba341
--- /dev/null
+++ b/pa3-tests/core/list_len.py
@@ -0,0 +1,4 @@
+x:[int] = None
+
+x = [1, 2, 3]
+print(len(x))
diff --git a/pa3-tests/core/list_len.py.ast.typed b/pa3-tests/core/list_len.py.ast.typed
new file mode 100644
index 0000000..5a34893
--- /dev/null
+++ b/pa3-tests/core/list_len.py.ast.typed
@@ -0,0 +1,154 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 14 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 3, 1, 3, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 6, 3, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 9, 3, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 12, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 4, 7, 4, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 7, 4, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 4, 11, 4, 11 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_len.py.ast.typed.s.result b/pa3-tests/core/list_len.py.ast.typed.s.result
new file mode 100644
index 0000000..00750ed
--- /dev/null
+++ b/pa3-tests/core/list_len.py.ast.typed.s.result
@@ -0,0 +1 @@
+3
diff --git a/pa3-tests/core/list_len_empty.py b/pa3-tests/core/list_len_empty.py
new file mode 100644
index 0000000..52bd178
--- /dev/null
+++ b/pa3-tests/core/list_len_empty.py
@@ -0,0 +1,4 @@
+x:[int] = None
+
+x = []
+print(len(x))
diff --git a/pa3-tests/core/list_len_empty.py.ast.typed b/pa3-tests/core/list_len_empty.py.ast.typed
new file mode 100644
index 0000000..4b70475
--- /dev/null
+++ b/pa3-tests/core/list_len_empty.py.ast.typed
@@ -0,0 +1,127 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 14 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
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+      }
+    }
+  } ],
+  "statements" : [ {
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+    "location" : [ 3, 1, 3, 6 ],
+    "targets" : [ {
+      "kind" : "Identifier",
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+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 6 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<Empty>"
+      },
+      "elements" : [ ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 4, 7, 4, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 7, 4, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 4, 11, 4, 11 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_len_empty.py.ast.typed.s.result b/pa3-tests/core/list_len_empty.py.ast.typed.s.result
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/pa3-tests/core/list_len_empty.py.ast.typed.s.result
@@ -0,0 +1 @@
+0
diff --git a/pa3-tests/core/list_set_element.py b/pa3-tests/core/list_set_element.py
new file mode 100644
index 0000000..c678fe9
--- /dev/null
+++ b/pa3-tests/core/list_set_element.py
@@ -0,0 +1,9 @@
+x:[int] = None
+
+x = [1, 2, 3]
+x[0] = 4
+x[1] = 5
+x[2] = 6
+print(x[0])
+print(x[1])
+print(x[2])
diff --git a/pa3-tests/core/list_set_element.py.ast.typed b/pa3-tests/core/list_set_element.py.ast.typed
new file mode 100644
index 0000000..69649ee
--- /dev/null
+++ b/pa3-tests/core/list_set_element.py.ast.typed
@@ -0,0 +1,382 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 9, 12 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 3, 1, 3, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 6, 3, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 9, 3, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 12, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 4, 1, 4, 8 ],
+    "targets" : [ {
+      "kind" : "IndexExpr",
+      "location" : [ 4, 1, 4, 4 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "list" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 1 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "x"
+      },
+      "index" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 3, 4, 3 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      }
+    } ],
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 4, 8, 4, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 4
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 5, 1, 5, 8 ],
+    "targets" : [ {
+      "kind" : "IndexExpr",
+      "location" : [ 5, 1, 5, 4 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "list" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 1, 5, 1 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "x"
+      },
+      "index" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 5, 3, 5, 3 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }
+    } ],
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 5, 8, 5, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 5
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 6, 1, 6, 8 ],
+    "targets" : [ {
+      "kind" : "IndexExpr",
+      "location" : [ 6, 1, 6, 4 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "list" : {
+        "kind" : "Identifier",
+        "location" : [ 6, 1, 6, 1 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "x"
+      },
+      "index" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 6, 3, 6, 3 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }
+    } ],
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 6, 8, 6, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 6
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 7, 1, 7, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 7, 1, 7, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 1, 7, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 7, 7, 7, 10 ],
+        "inferredType" : {
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+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
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+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 9, 7, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 0
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 8, 1, 8, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 8, 1, 8, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 1, 8, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 8, 7, 8, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 8, 7, 8, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 8, 9, 8, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 9, 1, 9, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 9, 1, 9, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 9, 1, 9, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 9, 7, 9, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 9, 7, 9, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 9, 9, 9, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 2
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_set_element.py.ast.typed.s.result b/pa3-tests/core/list_set_element.py.ast.typed.s.result
new file mode 100644
index 0000000..4578bc1
--- /dev/null
+++ b/pa3-tests/core/list_set_element.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+4
+5
+6
diff --git a/pa3-tests/core/list_set_element_none.py b/pa3-tests/core/list_set_element_none.py
new file mode 100644
index 0000000..281c7b4
--- /dev/null
+++ b/pa3-tests/core/list_set_element_none.py
@@ -0,0 +1,4 @@
+x:[int] = None
+
+x[0] = 1
+
diff --git a/pa3-tests/core/list_set_element_none.py.ast.typed b/pa3-tests/core/list_set_element_none.py.ast.typed
new file mode 100644
index 0000000..fd16a97
--- /dev/null
+++ b/pa3-tests/core/list_set_element_none.py.ast.typed
@@ -0,0 +1,81 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 3, 9 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 8 ],
+    "targets" : [ {
+      "kind" : "IndexExpr",
+      "location" : [ 3, 1, 3, 4 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "list" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "x"
+      },
+      "index" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 3, 3, 3 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      }
+    } ],
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 3, 8, 3, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 1
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_set_element_none.py.ast.typed.s.result b/pa3-tests/core/list_set_element_none.py.ast.typed.s.result
new file mode 100644
index 0000000..ae52477
--- /dev/null
+++ b/pa3-tests/core/list_set_element_none.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Operation on None
+Exited with error code 4
diff --git a/pa3-tests/core/list_set_element_oob_1.py b/pa3-tests/core/list_set_element_oob_1.py
new file mode 100644
index 0000000..efd92ca
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_1.py
@@ -0,0 +1,7 @@
+x:[int] = None
+
+x = [1, 2, 3]
+x[-1] = 4
+print(x[0])
+print(x[1])
+print(x[2])
diff --git a/pa3-tests/core/list_set_element_oob_1.py.ast.typed b/pa3-tests/core/list_set_element_oob_1.py.ast.typed
new file mode 100644
index 0000000..ed84b22
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_1.py.ast.typed
@@ -0,0 +1,309 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 7, 12 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 3, 1, 3, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 6, 3, 6 ],
+        "inferredType" : {
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+      }
+    } ],
+    "value" : {
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+      "inferredType" : {
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+    "expr" : {
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+        "inferredType" : {
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+          "parameters" : [ {
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+            "className" : "object"
+          } ],
+          "returnType" : {
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+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
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+        "inferredType" : {
+          "kind" : "ClassValueType",
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+              "className" : "int"
+            }
+          },
+          "name" : "x"
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+          "inferredType" : {
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+        }
+      } ]
+    }
+  }, {
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+    "location" : [ 6, 1, 6, 11 ],
+    "expr" : {
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+        },
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+        }
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+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 7, 1, 7, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 7, 1, 7, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
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+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
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+          } ],
+          "returnType" : {
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+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 7, 7, 7, 10 ],
+        "inferredType" : {
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+          "className" : "int"
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+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 7, 7, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 9, 7, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 2
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_set_element_oob_1.py.ast.typed.s.result b/pa3-tests/core/list_set_element_oob_1.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_1.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/list_set_element_oob_2.py b/pa3-tests/core/list_set_element_oob_2.py
new file mode 100644
index 0000000..301cea1
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_2.py
@@ -0,0 +1,7 @@
+x:[int] = None
+
+x = [1, 2, 3]
+x[4] = 4
+print(x[0])
+print(x[1])
+print(x[2])
diff --git a/pa3-tests/core/list_set_element_oob_2.py.ast.typed b/pa3-tests/core/list_set_element_oob_2.py.ast.typed
new file mode 100644
index 0000000..5c06dca
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_2.py.ast.typed
@@ -0,0 +1,300 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 7, 12 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
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+      "location" : [ 1, 11, 1, 14 ],
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+        "elementType" : {
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+          "className" : "int"
+        }
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+      "name" : "x"
+    } ],
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+      "location" : [ 3, 5, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
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+        "location" : [ 3, 6, 3, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 9, 3, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
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+      }, {
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+        "inferredType" : {
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+          }
+        },
+        "name" : "x"
+      },
+      "index" : {
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+        "location" : [ 4, 3, 4, 3 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 4
+      }
+    } ],
+    "value" : {
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+      "location" : [ 4, 8, 4, 8 ],
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+      },
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+    }
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+          }
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+        "name" : "print"
+      },
+      "args" : [ {
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+          "inferredType" : {
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+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
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+        },
+        "name" : "print"
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+        "kind" : "IndexExpr",
+        "location" : [ 6, 7, 6, 10 ],
+        "inferredType" : {
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+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 7, 6, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 6, 9, 6, 9 ],
+          "inferredType" : {
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+            "className" : "int"
+          },
+          "value" : 1
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 7, 1, 7, 11 ],
+    "expr" : {
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+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 1, 7, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
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+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 7, 7, 7, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 7, 7, 7 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "x"
+        },
+        "index" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 9, 7, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 2
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_set_element_oob_2.py.ast.typed.s.result b/pa3-tests/core/list_set_element_oob_2.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_2.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/list_set_element_oob_3.py b/pa3-tests/core/list_set_element_oob_3.py
new file mode 100644
index 0000000..281c93c
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_3.py
@@ -0,0 +1,4 @@
+x:[int] = None
+
+x = []
+x[0] = 4
diff --git a/pa3-tests/core/list_set_element_oob_3.py.ast.typed b/pa3-tests/core/list_set_element_oob_3.py.ast.typed
new file mode 100644
index 0000000..ec34032
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_3.py.ast.typed
@@ -0,0 +1,105 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 9 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 3, 1, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 4, 1, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 1, 11, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 6 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 3, 1, 3, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "x"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 3, 5, 3, 6 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<Empty>"
+      },
+      "elements" : [ ]
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 4, 1, 4, 8 ],
+    "targets" : [ {
+      "kind" : "IndexExpr",
+      "location" : [ 4, 1, 4, 4 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "list" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 1 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "x"
+      },
+      "index" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 3, 4, 3 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      }
+    } ],
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 4, 8, 4, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 4
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/list_set_element_oob_3.py.ast.typed.s.result b/pa3-tests/core/list_set_element_oob_3.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/list_set_element_oob_3.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/literal_bool.py b/pa3-tests/core/literal_bool.py
new file mode 100644
index 0000000..54b7f1f
--- /dev/null
+++ b/pa3-tests/core/literal_bool.py
@@ -0,0 +1,2 @@
+print(True)
+print(False)
diff --git a/pa3-tests/core/literal_bool.py.ast.typed b/pa3-tests/core/literal_bool.py.ast.typed
new file mode 100644
index 0000000..436e5f7
--- /dev/null
+++ b/pa3-tests/core/literal_bool.py.ast.typed
@@ -0,0 +1,83 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 2, 13 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 11 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BooleanLiteral",
+        "location" : [ 1, 7, 1, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 2, 1, 2, 12 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 2, 1, 2, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BooleanLiteral",
+        "location" : [ 2, 7, 2, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : false
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/literal_bool.py.ast.typed.s.result b/pa3-tests/core/literal_bool.py.ast.typed.s.result
new file mode 100644
index 0000000..1cc8b5e
--- /dev/null
+++ b/pa3-tests/core/literal_bool.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+True
+False
diff --git a/pa3-tests/core/literal_int.py b/pa3-tests/core/literal_int.py
new file mode 100644
index 0000000..3e78541
--- /dev/null
+++ b/pa3-tests/core/literal_int.py
@@ -0,0 +1,2 @@
+print(42)
+print(65999)
diff --git a/pa3-tests/core/literal_int.py.ast.typed b/pa3-tests/core/literal_int.py.ast.typed
new file mode 100644
index 0000000..eed7bda
--- /dev/null
+++ b/pa3-tests/core/literal_int.py.ast.typed
@@ -0,0 +1,83 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 2, 13 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 9 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 1, 7, 1, 8 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 2, 1, 2, 12 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 2, 1, 2, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 7, 2, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 65999
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/literal_int.py.ast.typed.s.result b/pa3-tests/core/literal_int.py.ast.typed.s.result
new file mode 100644
index 0000000..454025b
--- /dev/null
+++ b/pa3-tests/core/literal_int.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+42
+65999
diff --git a/pa3-tests/core/literal_str.py b/pa3-tests/core/literal_str.py
new file mode 100644
index 0000000..ad35e5a
--- /dev/null
+++ b/pa3-tests/core/literal_str.py
@@ -0,0 +1 @@
+print("Hello World")
diff --git a/pa3-tests/core/literal_str.py.ast.typed b/pa3-tests/core/literal_str.py.ast.typed
new file mode 100644
index 0000000..9b924a5
--- /dev/null
+++ b/pa3-tests/core/literal_str.py.ast.typed
@@ -0,0 +1,47 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 21 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 20 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 20 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "StringLiteral",
+        "location" : [ 1, 7, 1, 19 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "value" : "Hello World"
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/literal_str.py.ast.typed.s.result b/pa3-tests/core/literal_str.py.ast.typed.s.result
new file mode 100644
index 0000000..557db03
--- /dev/null
+++ b/pa3-tests/core/literal_str.py.ast.typed.s.result
@@ -0,0 +1 @@
+Hello World
diff --git a/pa3-tests/core/nested.py b/pa3-tests/core/nested.py
new file mode 100644
index 0000000..3faa85b
--- /dev/null
+++ b/pa3-tests/core/nested.py
@@ -0,0 +1,11 @@
+g: int = 1
+def foo(x: int) -> int:
+    y: int = 2
+    def bar() -> int:
+        z: int = 3
+        def baz() -> int:
+            return y
+        return baz()
+    return bar()
+    
+print(foo(g))
diff --git a/pa3-tests/core/nested.py.ast.typed b/pa3-tests/core/nested.py.ast.typed
new file mode 100644
index 0000000..ecdc57d
--- /dev/null
+++ b/pa3-tests/core/nested.py.ast.typed
@@ -0,0 +1,272 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 11, 14 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 6 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "g"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 4, 1, 6 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 10, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 1
+    }
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 2, 1, 9, 17 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 2, 5, 2, 7 ],
+      "name" : "foo"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 2, 9, 2, 14 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 9, 2, 9 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 12, 2, 14 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 2, 20, 2, 22 ],
+      "className" : "int"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 3, 5, 3, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 3, 5, 3, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 5, 3, 5 ],
+          "name" : "y"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 3, 8, 3, 10 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 14, 3, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 4, 5, 8, 21 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 9, 4, 11 ],
+        "name" : "bar"
+      },
+      "params" : [ ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 18, 4, 20 ],
+        "className" : "int"
+      },
+      "declarations" : [ {
+        "kind" : "VarDef",
+        "location" : [ 5, 9, 5, 18 ],
+        "var" : {
+          "kind" : "TypedVar",
+          "location" : [ 5, 9, 5, 14 ],
+          "identifier" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 9, 5, 9 ],
+            "name" : "z"
+          },
+          "type" : {
+            "kind" : "ClassType",
+            "location" : [ 5, 12, 5, 14 ],
+            "className" : "int"
+          }
+        },
+        "value" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 5, 18, 5, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 3
+        }
+      }, {
+        "kind" : "FuncDef",
+        "location" : [ 6, 9, 7, 21 ],
+        "name" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 13, 6, 15 ],
+          "name" : "baz"
+        },
+        "params" : [ ],
+        "returnType" : {
+          "kind" : "ClassType",
+          "location" : [ 6, 22, 6, 24 ],
+          "className" : "int"
+        },
+        "declarations" : [ ],
+        "statements" : [ {
+          "kind" : "ReturnStmt",
+          "location" : [ 7, 13, 7, 20 ],
+          "value" : {
+            "kind" : "Identifier",
+            "location" : [ 7, 20, 7, 20 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "name" : "y"
+          }
+        } ]
+      } ],
+      "statements" : [ {
+        "kind" : "ReturnStmt",
+        "location" : [ 8, 9, 8, 20 ],
+        "value" : {
+          "kind" : "CallExpr",
+          "location" : [ 8, 16, 8, 20 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 8, 16, 8, 18 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "baz"
+          },
+          "args" : [ ]
+        }
+      } ]
+    } ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 9, 5, 9, 16 ],
+      "value" : {
+        "kind" : "CallExpr",
+        "location" : [ 9, 12, 9, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 9, 12, 9, 14 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "bar"
+        },
+        "args" : [ ]
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 11, 1, 11, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 11, 1, 11, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 1, 11, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 11, 7, 11, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 11, 7, 11, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "foo"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 11, 11, 11, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "g"
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/nested.py.ast.typed.s.result b/pa3-tests/core/nested.py.ast.typed.s.result
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ b/pa3-tests/core/nested.py.ast.typed.s.result
@@ -0,0 +1 @@
+2
diff --git a/pa3-tests/core/nested2.py b/pa3-tests/core/nested2.py
new file mode 100644
index 0000000..abafcce
--- /dev/null
+++ b/pa3-tests/core/nested2.py
@@ -0,0 +1,14 @@
+g: int = 1
+def foo(x: int) -> int:
+    y: int = 2
+    def bar() -> int:
+        z: int = 3
+        def baz() -> int:
+            return qux(y)
+        return baz()
+    def qux(p: int) -> int:
+        return p
+
+    return bar()
+    
+print(foo(g))
diff --git a/pa3-tests/core/nested2.py.ast.typed b/pa3-tests/core/nested2.py.ast.typed
new file mode 100644
index 0000000..8955e9f
--- /dev/null
+++ b/pa3-tests/core/nested2.py.ast.typed
@@ -0,0 +1,337 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 14, 14 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 6 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "g"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 4, 1, 6 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 10, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 1
+    }
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 2, 1, 12, 17 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 2, 5, 2, 7 ],
+      "name" : "foo"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 2, 9, 2, 14 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 9, 2, 9 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 12, 2, 14 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 2, 20, 2, 22 ],
+      "className" : "int"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 3, 5, 3, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 3, 5, 3, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 5, 3, 5 ],
+          "name" : "y"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 3, 8, 3, 10 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 3, 14, 3, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 4, 5, 8, 21 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 9, 4, 11 ],
+        "name" : "bar"
+      },
+      "params" : [ ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 18, 4, 20 ],
+        "className" : "int"
+      },
+      "declarations" : [ {
+        "kind" : "VarDef",
+        "location" : [ 5, 9, 5, 18 ],
+        "var" : {
+          "kind" : "TypedVar",
+          "location" : [ 5, 9, 5, 14 ],
+          "identifier" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 9, 5, 9 ],
+            "name" : "z"
+          },
+          "type" : {
+            "kind" : "ClassType",
+            "location" : [ 5, 12, 5, 14 ],
+            "className" : "int"
+          }
+        },
+        "value" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 5, 18, 5, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 3
+        }
+      }, {
+        "kind" : "FuncDef",
+        "location" : [ 6, 9, 7, 26 ],
+        "name" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 13, 6, 15 ],
+          "name" : "baz"
+        },
+        "params" : [ ],
+        "returnType" : {
+          "kind" : "ClassType",
+          "location" : [ 6, 22, 6, 24 ],
+          "className" : "int"
+        },
+        "declarations" : [ ],
+        "statements" : [ {
+          "kind" : "ReturnStmt",
+          "location" : [ 7, 13, 7, 25 ],
+          "value" : {
+            "kind" : "CallExpr",
+            "location" : [ 7, 20, 7, 25 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "function" : {
+              "kind" : "Identifier",
+              "location" : [ 7, 20, 7, 22 ],
+              "inferredType" : {
+                "kind" : "FuncType",
+                "parameters" : [ {
+                  "kind" : "ClassValueType",
+                  "className" : "int"
+                } ],
+                "returnType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "int"
+                }
+              },
+              "name" : "qux"
+            },
+            "args" : [ {
+              "kind" : "Identifier",
+              "location" : [ 7, 24, 7, 24 ],
+              "inferredType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              },
+              "name" : "y"
+            } ]
+          }
+        } ]
+      } ],
+      "statements" : [ {
+        "kind" : "ReturnStmt",
+        "location" : [ 8, 9, 8, 20 ],
+        "value" : {
+          "kind" : "CallExpr",
+          "location" : [ 8, 16, 8, 20 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 8, 16, 8, 18 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "baz"
+          },
+          "args" : [ ]
+        }
+      } ]
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 9, 5, 10, 17 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 9, 9, 9, 11 ],
+        "name" : "qux"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 9, 13, 9, 18 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 9, 13, 9, 13 ],
+          "name" : "p"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 9, 16, 9, 18 ],
+          "className" : "int"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 9, 24, 9, 26 ],
+        "className" : "int"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ReturnStmt",
+        "location" : [ 10, 9, 10, 16 ],
+        "value" : {
+          "kind" : "Identifier",
+          "location" : [ 10, 16, 10, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "p"
+        }
+      } ]
+    } ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 12, 5, 12, 16 ],
+      "value" : {
+        "kind" : "CallExpr",
+        "location" : [ 12, 12, 12, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 12, 12, 12, 14 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "bar"
+        },
+        "args" : [ ]
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 14, 1, 14, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 14, 1, 14, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 14, 1, 14, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 14, 7, 14, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 14, 7, 14, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "foo"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 14, 11, 14, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "g"
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/nested2.py.ast.typed.s.result b/pa3-tests/core/nested2.py.ast.typed.s.result
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ b/pa3-tests/core/nested2.py.ast.typed.s.result
@@ -0,0 +1 @@
+2
diff --git a/pa3-tests/core/object_attr_get.py b/pa3-tests/core/object_attr_get.py
new file mode 100644
index 0000000..a6bed67
--- /dev/null
+++ b/pa3-tests/core/object_attr_get.py
@@ -0,0 +1,16 @@
+class A(object):
+    a:int = 42
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+a:A = None
+b:B = None
+
+a = b = B()
+print(a.a)
+print(b.a)
+print(b.b)
diff --git a/pa3-tests/core/object_attr_get.py.ast.typed b/pa3-tests/core/object_attr_get.py.ast.typed
new file mode 100644
index 0000000..f87f054
--- /dev/null
+++ b/pa3-tests/core/object_attr_get.py.ast.typed
@@ -0,0 +1,387 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 16, 11 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 2, 15 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    } ]
+  }, {
+    "kind" : "ClassDef",
+    "location" : [ 4, 1, 10, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 7, 4, 7 ],
+      "name" : "B"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 9, 4, 9 ],
+      "name" : "A"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 5, 5, 5, 17 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 5, 5, 5, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 5, 5, 5 ],
+          "name" : "b"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 5, 7, 5, 10 ],
+          "className" : "bool"
+        }
+      },
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 5, 14, 5, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 7, 5, 8, 19 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 9, 7, 16 ],
+        "name" : "__init__"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 7, 18, 7, 25 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 18, 7, 21 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 7, 23, 7, 25 ],
+          "className" : "B"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 7, 27, 7, 27 ],
+        "className" : "<None>"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 8, 9, 8, 18 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 8, 9, 8, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 8, 9, 8, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "StringLiteral",
+            "location" : [ 8, 15, 8, 17 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "value" : "B"
+          } ]
+        }
+      } ]
+    } ]
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 10, 1, 10, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 10, 1, 10, 3 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 10, 1, 10, 1 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 10, 3, 10, 3 ],
+        "className" : "A"
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 10, 7, 10, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 11, 1, 11, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 11, 1, 11, 3 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 1, 11, 1 ],
+        "name" : "b"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 11, 3, 11, 3 ],
+        "className" : "B"
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 11, 7, 11, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 13, 1, 13, 11 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 13, 1, 13, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "A"
+      },
+      "name" : "a"
+    }, {
+      "kind" : "Identifier",
+      "location" : [ 13, 5, 13, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "B"
+      },
+      "name" : "b"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 13, 9, 13, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "B"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 13, 9, 13, 9 ],
+        "name" : "B"
+      },
+      "args" : [ ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 14, 1, 14, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 14, 1, 14, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 14, 1, 14, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MemberExpr",
+        "location" : [ 14, 7, 14, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 14, 7, 14, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "A"
+          },
+          "name" : "a"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 14, 9, 14, 9 ],
+          "name" : "a"
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 15, 1, 15, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 15, 1, 15, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 15, 1, 15, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MemberExpr",
+        "location" : [ 15, 7, 15, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 15, 7, 15, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "B"
+          },
+          "name" : "b"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 15, 9, 15, 9 ],
+          "name" : "a"
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 16, 1, 16, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 16, 1, 16, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 16, 1, 16, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MemberExpr",
+        "location" : [ 16, 7, 16, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 16, 7, 16, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "B"
+          },
+          "name" : "b"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 16, 9, 16, 9 ],
+          "name" : "b"
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_attr_get.py.ast.typed.s.result b/pa3-tests/core/object_attr_get.py.ast.typed.s.result
new file mode 100644
index 0000000..79171bc
--- /dev/null
+++ b/pa3-tests/core/object_attr_get.py.ast.typed.s.result
@@ -0,0 +1,4 @@
+B
+42
+42
+True
diff --git a/pa3-tests/core/object_attr_get_none.py b/pa3-tests/core/object_attr_get_none.py
new file mode 100644
index 0000000..270bb16
--- /dev/null
+++ b/pa3-tests/core/object_attr_get_none.py
@@ -0,0 +1,16 @@
+class A(object):
+    a:int = 42
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+a:A = None
+b:B = None
+
+a = B()
+print(a.a)
+print(b.a)
+print(b.b)
diff --git a/pa3-tests/core/object_attr_get_none.py.ast.typed b/pa3-tests/core/object_attr_get_none.py.ast.typed
new file mode 100644
index 0000000..2787984
--- /dev/null
+++ b/pa3-tests/core/object_attr_get_none.py.ast.typed
@@ -0,0 +1,379 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 16, 11 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 2, 15 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    } ]
+  }, {
+    "kind" : "ClassDef",
+    "location" : [ 4, 1, 10, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 7, 4, 7 ],
+      "name" : "B"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 9, 4, 9 ],
+      "name" : "A"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 5, 5, 5, 17 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 5, 5, 5, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 5, 5, 5 ],
+          "name" : "b"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 5, 7, 5, 10 ],
+          "className" : "bool"
+        }
+      },
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 5, 14, 5, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 7, 5, 8, 19 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 9, 7, 16 ],
+        "name" : "__init__"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 7, 18, 7, 25 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 18, 7, 21 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 7, 23, 7, 25 ],
+          "className" : "B"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 7, 27, 7, 27 ],
+        "className" : "<None>"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 8, 9, 8, 18 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 8, 9, 8, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 8, 9, 8, 13 ],
+            "inferredType" : {
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+          }
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+        "location" : [ 16, 7, 16, 9 ],
+        "inferredType" : {
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+          "className" : "bool"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 16, 7, 16, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "B"
+          },
+          "name" : "b"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 16, 9, 16, 9 ],
+          "name" : "b"
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_attr_get_none.py.ast.typed.s.result b/pa3-tests/core/object_attr_get_none.py.ast.typed.s.result
new file mode 100644
index 0000000..80d81d1
--- /dev/null
+++ b/pa3-tests/core/object_attr_get_none.py.ast.typed.s.result
@@ -0,0 +1,4 @@
+B
+42
+Operation on None
+Exited with error code 4
diff --git a/pa3-tests/core/object_attr_set.py b/pa3-tests/core/object_attr_set.py
new file mode 100644
index 0000000..4183999
--- /dev/null
+++ b/pa3-tests/core/object_attr_set.py
@@ -0,0 +1,18 @@
+class A(object):
+    a:int = 42
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+a:A = None
+b:B = None
+
+a = b = B()
+b.a = 1
+b.b = False
+print(a.a)
+print(b.a)
+print(b.b)
diff --git a/pa3-tests/core/object_attr_set.py.ast.typed b/pa3-tests/core/object_attr_set.py.ast.typed
new file mode 100644
index 0000000..4ea6427
--- /dev/null
+++ b/pa3-tests/core/object_attr_set.py.ast.typed
@@ -0,0 +1,455 @@
+{
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+    "location" : [ 1, 1, 2, 15 ],
+    "name" : {
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+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
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+        "value" : 42
+      }
+    } ]
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+        },
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+        }
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+          } ],
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+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
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+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 18, 7, 18, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "B"
+          },
+          "name" : "b"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 18, 9, 18, 9 ],
+          "name" : "b"
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_attr_set.py.ast.typed.s.result b/pa3-tests/core/object_attr_set.py.ast.typed.s.result
new file mode 100644
index 0000000..abf1b17
--- /dev/null
+++ b/pa3-tests/core/object_attr_set.py.ast.typed.s.result
@@ -0,0 +1,4 @@
+B
+1
+1
+False
diff --git a/pa3-tests/core/object_attr_set_eval_order.py b/pa3-tests/core/object_attr_set_eval_order.py
new file mode 100644
index 0000000..162559d
--- /dev/null
+++ b/pa3-tests/core/object_attr_set_eval_order.py
@@ -0,0 +1,33 @@
+class A(object):
+    a:int = 42
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+a:A = None
+b:B = None
+
+def get_b() -> B:
+    print("Getting B")
+    return b
+
+def get_one() -> int:
+    print("Getting 1")
+    return 1
+
+def get_false() -> bool:
+    print("Getting False")
+    return False
+
+a = b = B()
+get_b().a = get_one()
+print("Assigned B.a")
+get_b().b = get_false()
+print("Assigned B.b")
+
+print(a.a)
+print(b.a)
+print(b.b)
diff --git a/pa3-tests/core/object_attr_set_eval_order.py.ast.typed b/pa3-tests/core/object_attr_set_eval_order.py.ast.typed
new file mode 100644
index 0000000..16ae244
--- /dev/null
+++ b/pa3-tests/core/object_attr_set_eval_order.py.ast.typed
@@ -0,0 +1,771 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 33, 11 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 2, 15 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    } ]
+  }, {
+    "kind" : "ClassDef",
+    "location" : [ 4, 1, 10, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 7, 4, 7 ],
+      "name" : "B"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 9, 4, 9 ],
+      "name" : "A"
+    },
+    "declarations" : [ {
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+      "location" : [ 5, 5, 5, 17 ],
+      "var" : {
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+        "location" : [ 5, 5, 5, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 5, 5, 5 ],
+          "name" : "b"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 5, 7, 5, 10 ],
+          "className" : "bool"
+        }
+      },
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 5, 14, 5, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    }, {
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+      "name" : {
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+        "name" : "__init__"
+      },
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+          "name" : "self"
+        },
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+        }
+      } ],
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+                "className" : "object"
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+              }
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+            "name" : "print"
+          },
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+            "location" : [ 8, 15, 8, 17 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "value" : "B"
+          } ]
+        }
+      } ]
+    } ]
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 10, 1, 10, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 10, 1, 10, 3 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 10, 1, 10, 1 ],
+        "name" : "a"
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+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 10, 3, 10, 3 ],
+        "className" : "A"
+      }
+    },
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+      "kind" : "NoneLiteral",
+      "location" : [ 10, 7, 10, 10 ],
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+  }, {
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+      "kind" : "TypedVar",
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+        "className" : "B"
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+    },
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+      }
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+        },
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+          "kind" : "Identifier",
+          "location" : [ 18, 5, 18, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
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+            "className" : "str"
+          },
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+        } ]
+      }
+    }, {
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+          "className" : "int"
+        },
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+      }
+    } ]
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+          "inferredType" : {
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+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 22, 11, 22, 25 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "Getting False"
+        } ]
+      }
+    }, {
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+      "location" : [ 23, 5, 23, 16 ],
+      "value" : {
+        "kind" : "BooleanLiteral",
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+        },
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+    } ]
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+    "targets" : [ {
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+        "className" : "A"
+      },
+      "name" : "a"
+    }, {
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+      "location" : [ 25, 5, 25, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "B"
+      },
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+    } ],
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+        "kind" : "Identifier",
+        "location" : [ 25, 9, 25, 9 ],
+        "name" : "B"
+      },
+      "args" : [ ]
+    }
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+    "targets" : [ {
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+            "returnType" : {
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+        },
+        "args" : [ ]
+      },
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+      }
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+      "location" : [ 26, 13, 26, 21 ],
+      "inferredType" : {
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+        "kind" : "Identifier",
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+        "inferredType" : {
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+          "parameters" : [ ],
+          "returnType" : {
+            "kind" : "ClassValueType",
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+    }
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+        },
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+      } ]
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+        "inferredType" : {
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+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MemberExpr",
+        "location" : [ 33, 7, 33, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 33, 7, 33, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "B"
+          },
+          "name" : "b"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 33, 9, 33, 9 ],
+          "name" : "b"
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_attr_set_eval_order.py.ast.typed.s.result b/pa3-tests/core/object_attr_set_eval_order.py.ast.typed.s.result
new file mode 100644
index 0000000..3f82dac
--- /dev/null
+++ b/pa3-tests/core/object_attr_set_eval_order.py.ast.typed.s.result
@@ -0,0 +1,10 @@
+B
+Getting 1
+Getting B
+Assigned B.a
+Getting False
+Getting B
+Assigned B.b
+1
+1
+False
diff --git a/pa3-tests/core/object_attr_set_none.py b/pa3-tests/core/object_attr_set_none.py
new file mode 100644
index 0000000..bfd3184
--- /dev/null
+++ b/pa3-tests/core/object_attr_set_none.py
@@ -0,0 +1,19 @@
+class A(object):
+    a:int = 42
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+a:A = None
+b:B = None
+
+a = B()
+print(a.a)
+
+b.a = 1
+b.b = False
+print(b.a)
+print(b.b)
diff --git a/pa3-tests/core/object_attr_set_none.py.ast.typed b/pa3-tests/core/object_attr_set_none.py.ast.typed
new file mode 100644
index 0000000..e6f5695
--- /dev/null
+++ b/pa3-tests/core/object_attr_set_none.py.ast.typed
@@ -0,0 +1,447 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 19, 11 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 2, 15 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    } ]
+  }, {
+    "kind" : "ClassDef",
+    "location" : [ 4, 1, 10, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 7, 4, 7 ],
+      "name" : "B"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 9, 4, 9 ],
+      "name" : "A"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 5, 5, 5, 17 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 5, 5, 5, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 5, 5, 5 ],
+          "name" : "b"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 5, 7, 5, 10 ],
+          "className" : "bool"
+        }
+      },
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 5, 14, 5, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 7, 5, 8, 19 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 9, 7, 16 ],
+        "name" : "__init__"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 7, 18, 7, 25 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 18, 7, 21 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 7, 23, 7, 25 ],
+          "className" : "B"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 7, 27, 7, 27 ],
+        "className" : "<None>"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 8, 9, 8, 18 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 8, 9, 8, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 8, 9, 8, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "StringLiteral",
+            "location" : [ 8, 15, 8, 17 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "value" : "B"
+          } ]
+        }
+      } ]
+    } ]
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 10, 1, 10, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 10, 1, 10, 3 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 10, 1, 10, 1 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 10, 3, 10, 3 ],
+        "className" : "A"
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 10, 7, 10, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 11, 1, 11, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 11, 1, 11, 3 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 1, 11, 1 ],
+        "name" : "b"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 11, 3, 11, 3 ],
+        "className" : "B"
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 11, 7, 11, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 13, 1, 13, 7 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 13, 1, 13, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "A"
+      },
+      "name" : "a"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 13, 5, 13, 7 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "B"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 13, 5, 13, 5 ],
+        "name" : "B"
+      },
+      "args" : [ ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 14, 1, 14, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 14, 1, 14, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 14, 1, 14, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MemberExpr",
+        "location" : [ 14, 7, 14, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 14, 7, 14, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "A"
+          },
+          "name" : "a"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 14, 9, 14, 9 ],
+          "name" : "a"
+        }
+      } ]
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 16, 1, 16, 7 ],
+    "targets" : [ {
+      "kind" : "MemberExpr",
+      "location" : [ 16, 1, 16, 3 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "object" : {
+        "kind" : "Identifier",
+        "location" : [ 16, 1, 16, 1 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "B"
+        },
+        "name" : "b"
+      },
+      "member" : {
+        "kind" : "Identifier",
+        "location" : [ 16, 3, 16, 3 ],
+        "name" : "a"
+      }
+    } ],
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 16, 7, 16, 7 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 1
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 17, 1, 17, 11 ],
+    "targets" : [ {
+      "kind" : "MemberExpr",
+      "location" : [ 17, 1, 17, 3 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "bool"
+      },
+      "object" : {
+        "kind" : "Identifier",
+        "location" : [ 17, 1, 17, 1 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "B"
+        },
+        "name" : "b"
+      },
+      "member" : {
+        "kind" : "Identifier",
+        "location" : [ 17, 3, 17, 3 ],
+        "name" : "b"
+      }
+    } ],
+    "value" : {
+      "kind" : "BooleanLiteral",
+      "location" : [ 17, 7, 17, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "bool"
+      },
+      "value" : false
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 18, 1, 18, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 18, 1, 18, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 18, 1, 18, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MemberExpr",
+        "location" : [ 18, 7, 18, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 18, 7, 18, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "B"
+          },
+          "name" : "b"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 18, 9, 18, 9 ],
+          "name" : "a"
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 19, 1, 19, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 19, 1, 19, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 19, 1, 19, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MemberExpr",
+        "location" : [ 19, 7, 19, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "object" : {
+          "kind" : "Identifier",
+          "location" : [ 19, 7, 19, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "B"
+          },
+          "name" : "b"
+        },
+        "member" : {
+          "kind" : "Identifier",
+          "location" : [ 19, 9, 19, 9 ],
+          "name" : "b"
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_attr_set_none.py.ast.typed.s.result b/pa3-tests/core/object_attr_set_none.py.ast.typed.s.result
new file mode 100644
index 0000000..80d81d1
--- /dev/null
+++ b/pa3-tests/core/object_attr_set_none.py.ast.typed.s.result
@@ -0,0 +1,4 @@
+B
+42
+Operation on None
+Exited with error code 4
diff --git a/pa3-tests/core/object_init.py b/pa3-tests/core/object_init.py
new file mode 100644
index 0000000..e48a5cd
--- /dev/null
+++ b/pa3-tests/core/object_init.py
@@ -0,0 +1,11 @@
+class A(object):
+    a:int = 42
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+
+B()
diff --git a/pa3-tests/core/object_init.py.ast.typed b/pa3-tests/core/object_init.py.ast.typed
new file mode 100644
index 0000000..1ed066e
--- /dev/null
+++ b/pa3-tests/core/object_init.py.ast.typed
@@ -0,0 +1,173 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 11, 4 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 2, 15 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    } ]
+  }, {
+    "kind" : "ClassDef",
+    "location" : [ 4, 1, 11, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 7, 4, 7 ],
+      "name" : "B"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 9, 4, 9 ],
+      "name" : "A"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 5, 5, 5, 17 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 5, 5, 5, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 5, 5, 5 ],
+          "name" : "b"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 5, 7, 5, 10 ],
+          "className" : "bool"
+        }
+      },
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 5, 14, 5, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 7, 5, 8, 19 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 9, 7, 16 ],
+        "name" : "__init__"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 7, 18, 7, 25 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 18, 7, 21 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 7, 23, 7, 25 ],
+          "className" : "B"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 7, 27, 7, 27 ],
+        "className" : "<None>"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 8, 9, 8, 18 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 8, 9, 8, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 8, 9, 8, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "StringLiteral",
+            "location" : [ 8, 15, 8, 17 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "value" : "B"
+          } ]
+        }
+      } ]
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 11, 1, 11, 3 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 11, 1, 11, 3 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "B"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 1, 11, 1 ],
+        "name" : "B"
+      },
+      "args" : [ ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_init.py.ast.typed.s.result b/pa3-tests/core/object_init.py.ast.typed.s.result
new file mode 100644
index 0000000..223b783
--- /dev/null
+++ b/pa3-tests/core/object_init.py.ast.typed.s.result
@@ -0,0 +1 @@
+B
diff --git a/pa3-tests/core/object_method.py b/pa3-tests/core/object_method.py
new file mode 100644
index 0000000..6b71299
--- /dev/null
+++ b/pa3-tests/core/object_method.py
@@ -0,0 +1,16 @@
+class A(object):
+    a:int = 42
+
+    def foo(self:"A", ignore:object) -> int:
+        return self.a
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+    def bar(self:"B") -> int:
+        return self.foo(self.b)
+
+print(B().bar())
diff --git a/pa3-tests/core/object_method.py.ast.typed b/pa3-tests/core/object_method.py.ast.typed
new file mode 100644
index 0000000..955c83b
--- /dev/null
+++ b/pa3-tests/core/object_method.py.ast.typed
@@ -0,0 +1,387 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 16, 17 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 7, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 4, 5, 5, 22 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 9, 4, 11 ],
+        "name" : "foo"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 4, 13, 4, 20 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 13, 4, 16 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 4, 18, 4, 20 ],
+          "className" : "A"
+        }
+      }, {
+        "kind" : "TypedVar",
+        "location" : [ 4, 23, 4, 35 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 23, 4, 28 ],
+          "name" : "ignore"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 4, 30, 4, 35 ],
+          "className" : "object"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 41, 4, 43 ],
+        "className" : "int"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ReturnStmt",
+        "location" : [ 5, 9, 5, 21 ],
+        "value" : {
+          "kind" : "MemberExpr",
+          "location" : [ 5, 16, 5, 21 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "object" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 16, 5, 19 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "A"
+            },
+            "name" : "self"
+          },
+          "member" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 21, 5, 21 ],
+            "name" : "a"
+          }
+        }
+      } ]
+    } ]
+  }, {
+    "kind" : "ClassDef",
+    "location" : [ 7, 1, 16, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 7, 7, 7 ],
+      "name" : "B"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 9, 7, 9 ],
+      "name" : "A"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 8, 5, 8, 17 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 8, 5, 8, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 8, 5, 8, 5 ],
+          "name" : "b"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 8, 7, 8, 10 ],
+          "className" : "bool"
+        }
+      },
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 8, 14, 8, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 10, 5, 11, 19 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 10, 9, 10, 16 ],
+        "name" : "__init__"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 10, 18, 10, 25 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 10, 18, 10, 21 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 10, 23, 10, 25 ],
+          "className" : "B"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 10, 27, 10, 27 ],
+        "className" : "<None>"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 11, 9, 11, 18 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 11, 9, 11, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 11, 9, 11, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "StringLiteral",
+            "location" : [ 11, 15, 11, 17 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "value" : "B"
+          } ]
+        }
+      } ]
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 13, 5, 14, 32 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 13, 9, 13, 11 ],
+        "name" : "bar"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 13, 13, 13, 20 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 13, 13, 13, 16 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 13, 18, 13, 20 ],
+          "className" : "B"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 13, 26, 13, 28 ],
+        "className" : "int"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ReturnStmt",
+        "location" : [ 14, 9, 14, 31 ],
+        "value" : {
+          "kind" : "MethodCallExpr",
+          "location" : [ 14, 16, 14, 31 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "method" : {
+            "kind" : "MemberExpr",
+            "location" : [ 14, 16, 14, 23 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "A"
+              }, {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "object" : {
+              "kind" : "Identifier",
+              "location" : [ 14, 16, 14, 19 ],
+              "inferredType" : {
+                "kind" : "ClassValueType",
+                "className" : "B"
+              },
+              "name" : "self"
+            },
+            "member" : {
+              "kind" : "Identifier",
+              "location" : [ 14, 21, 14, 23 ],
+              "name" : "foo"
+            }
+          },
+          "args" : [ {
+            "kind" : "MemberExpr",
+            "location" : [ 14, 25, 14, 30 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "bool"
+            },
+            "object" : {
+              "kind" : "Identifier",
+              "location" : [ 14, 25, 14, 28 ],
+              "inferredType" : {
+                "kind" : "ClassValueType",
+                "className" : "B"
+              },
+              "name" : "self"
+            },
+            "member" : {
+              "kind" : "Identifier",
+              "location" : [ 14, 30, 14, 30 ],
+              "name" : "b"
+            }
+          } ]
+        }
+      } ]
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 16, 1, 16, 16 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 16, 1, 16, 16 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 16, 1, 16, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MethodCallExpr",
+        "location" : [ 16, 7, 16, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "method" : {
+          "kind" : "MemberExpr",
+          "location" : [ 16, 7, 16, 13 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "B"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "object" : {
+            "kind" : "CallExpr",
+            "location" : [ 16, 7, 16, 9 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "B"
+            },
+            "function" : {
+              "kind" : "Identifier",
+              "location" : [ 16, 7, 16, 7 ],
+              "name" : "B"
+            },
+            "args" : [ ]
+          },
+          "member" : {
+            "kind" : "Identifier",
+            "location" : [ 16, 11, 16, 13 ],
+            "name" : "bar"
+          }
+        },
+        "args" : [ ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_method.py.ast.typed.s.result b/pa3-tests/core/object_method.py.ast.typed.s.result
new file mode 100644
index 0000000..418c69b
--- /dev/null
+++ b/pa3-tests/core/object_method.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+B
+42
diff --git a/pa3-tests/core/object_method_complex_call.py b/pa3-tests/core/object_method_complex_call.py
new file mode 100644
index 0000000..d82ec1b
--- /dev/null
+++ b/pa3-tests/core/object_method_complex_call.py
@@ -0,0 +1,19 @@
+class A(object):
+    a:int = 42
+
+    def foo(self:"A", ignore:object) -> int:
+        return self.a
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+    def bar(self:"B") -> int:
+        return self.foo(self.foo(print("...")))
+
+    def foo(self:"B", ignore:object) -> int:
+        return 1
+
+print(B().bar())
diff --git a/pa3-tests/core/object_method_complex_call.py.ast.typed b/pa3-tests/core/object_method_complex_call.py.ast.typed
new file mode 100644
index 0000000..270f634
--- /dev/null
+++ b/pa3-tests/core/object_method_complex_call.py.ast.typed
@@ -0,0 +1,492 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 19, 17 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 7, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 4, 5, 5, 22 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 9, 4, 11 ],
+        "name" : "foo"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 4, 13, 4, 20 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 13, 4, 16 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 4, 18, 4, 20 ],
+          "className" : "A"
+        }
+      }, {
+        "kind" : "TypedVar",
+        "location" : [ 4, 23, 4, 35 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 23, 4, 28 ],
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+        },
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+        }
+      } ],
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+      },
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+            "location" : [ 5, 16, 5, 19 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "A"
+            },
+            "name" : "self"
+          },
+          "member" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 21, 5, 21 ],
+            "name" : "a"
+          }
+        }
+      } ]
+    } ]
+  }, {
+    "kind" : "ClassDef",
+    "location" : [ 7, 1, 19, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 7, 7, 7 ],
+      "name" : "B"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
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+      "name" : "A"
+    },
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+      "var" : {
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+          "name" : "b"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 8, 7, 8, 10 ],
+          "className" : "bool"
+        }
+      },
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 8, 14, 8, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 10, 5, 11, 19 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 10, 9, 10, 16 ],
+        "name" : "__init__"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 10, 18, 10, 25 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 10, 18, 10, 21 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 10, 23, 10, 25 ],
+          "className" : "B"
+        }
+      } ],
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+      },
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+              "returnType" : {
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+            "name" : "print"
+          },
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+                "className" : "object"
+              } ],
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+                "kind" : "ClassValueType",
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+              }
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+                } ],
+                "returnType" : {
+                  "kind" : "ClassValueType",
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+                }
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+                "inferredType" : {
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+              },
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+                "kind" : "Identifier",
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+                "name" : "foo"
+              }
+            },
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+              "inferredType" : {
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+                "className" : "<None>"
+              },
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+                "kind" : "Identifier",
+                "location" : [ 14, 34, 14, 38 ],
+                "inferredType" : {
+                  "kind" : "FuncType",
+                  "parameters" : [ {
+                    "kind" : "ClassValueType",
+                    "className" : "object"
+                  } ],
+                  "returnType" : {
+                    "kind" : "ClassValueType",
+                    "className" : "<None>"
+                  }
+                },
+                "name" : "print"
+              },
+              "args" : [ {
+                "kind" : "StringLiteral",
+                "location" : [ 14, 40, 14, 44 ],
+                "inferredType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "str"
+                },
+                "value" : "..."
+              } ]
+            } ]
+          } ]
+        }
+      } ]
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 16, 5, 17, 17 ],
+      "name" : {
+        "kind" : "Identifier",
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+        "name" : "foo"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
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+        "identifier" : {
+          "kind" : "Identifier",
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+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 16, 18, 16, 20 ],
+          "className" : "B"
+        }
+      }, {
+        "kind" : "TypedVar",
+        "location" : [ 16, 23, 16, 35 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 16, 23, 16, 28 ],
+          "name" : "ignore"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 16, 30, 16, 35 ],
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+        }
+      } ],
+      "returnType" : {
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+      },
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+        "kind" : "ReturnStmt",
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+        "value" : {
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+          },
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+        }
+      } ]
+    } ]
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+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MethodCallExpr",
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+        "inferredType" : {
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+        },
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+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "B"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "object" : {
+            "kind" : "CallExpr",
+            "location" : [ 19, 7, 19, 9 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "B"
+            },
+            "function" : {
+              "kind" : "Identifier",
+              "location" : [ 19, 7, 19, 7 ],
+              "name" : "B"
+            },
+            "args" : [ ]
+          },
+          "member" : {
+            "kind" : "Identifier",
+            "location" : [ 19, 11, 19, 13 ],
+            "name" : "bar"
+          }
+        },
+        "args" : [ ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_method_complex_call.py.ast.typed.s.result b/pa3-tests/core/object_method_complex_call.py.ast.typed.s.result
new file mode 100644
index 0000000..f83c3f1
--- /dev/null
+++ b/pa3-tests/core/object_method_complex_call.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+B
+...
+1
diff --git a/pa3-tests/core/object_method_nested.py b/pa3-tests/core/object_method_nested.py
new file mode 100644
index 0000000..b193ecd
--- /dev/null
+++ b/pa3-tests/core/object_method_nested.py
@@ -0,0 +1,18 @@
+class A(object):
+    a:int = 42
+
+    def foo(self:"A", ignore:object) -> int:
+        return self.a
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+    def bar(self:"B") -> int:
+        def qux(p: bool) -> int:
+            return self.foo(p)
+        return qux(True)
+
+print(B().bar())
diff --git a/pa3-tests/core/object_method_nested.py.ast.typed b/pa3-tests/core/object_method_nested.py.ast.typed
new file mode 100644
index 0000000..5480892
--- /dev/null
+++ b/pa3-tests/core/object_method_nested.py.ast.typed
@@ -0,0 +1,439 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 18, 17 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 7, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
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+          "location" : [ 2, 5, 2, 5 ],
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+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 4, 5, 5, 22 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 9, 4, 11 ],
+        "name" : "foo"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 4, 13, 4, 20 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 13, 4, 16 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 4, 18, 4, 20 ],
+          "className" : "A"
+        }
+      }, {
+        "kind" : "TypedVar",
+        "location" : [ 4, 23, 4, 35 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 23, 4, 28 ],
+          "name" : "ignore"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 4, 30, 4, 35 ],
+          "className" : "object"
+        }
+      } ],
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+        "kind" : "ClassType",
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+        "className" : "int"
+      },
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+      "statements" : [ {
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+        "value" : {
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+          "location" : [ 5, 16, 5, 21 ],
+          "inferredType" : {
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+            "className" : "int"
+          },
+          "object" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 16, 5, 19 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "A"
+            },
+            "name" : "self"
+          },
+          "member" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 21, 5, 21 ],
+            "name" : "a"
+          }
+        }
+      } ]
+    } ]
+  }, {
+    "kind" : "ClassDef",
+    "location" : [ 7, 1, 18, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 7, 7, 7 ],
+      "name" : "B"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 9, 7, 9 ],
+      "name" : "A"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 8, 5, 8, 17 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 8, 5, 8, 10 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 8, 5, 8, 5 ],
+          "name" : "b"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 8, 7, 8, 10 ],
+          "className" : "bool"
+        }
+      },
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 8, 14, 8, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 10, 5, 11, 19 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 10, 9, 10, 16 ],
+        "name" : "__init__"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 10, 18, 10, 25 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 10, 18, 10, 21 ],
+          "name" : "self"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 10, 23, 10, 25 ],
+          "className" : "B"
+        }
+      } ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 10, 27, 10, 27 ],
+        "className" : "<None>"
+      },
+      "declarations" : [ ],
+      "statements" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 11, 9, 11, 18 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 11, 9, 11, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 11, 9, 11, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "StringLiteral",
+            "location" : [ 11, 15, 11, 17 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "value" : "B"
+          } ]
+        }
+      } ]
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 13, 5, 16, 25 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 13, 9, 13, 11 ],
+        "name" : "bar"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
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+        "identifier" : {
+          "kind" : "Identifier",
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+        },
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+        }
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+      },
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+          "name" : "qux"
+        },
+        "params" : [ {
+          "kind" : "TypedVar",
+          "location" : [ 14, 17, 14, 23 ],
+          "identifier" : {
+            "kind" : "Identifier",
+            "location" : [ 14, 17, 14, 17 ],
+            "name" : "p"
+          },
+          "type" : {
+            "kind" : "ClassType",
+            "location" : [ 14, 20, 14, 23 ],
+            "className" : "bool"
+          }
+        } ],
+        "returnType" : {
+          "kind" : "ClassType",
+          "location" : [ 14, 29, 14, 31 ],
+          "className" : "int"
+        },
+        "declarations" : [ ],
+        "statements" : [ {
+          "kind" : "ReturnStmt",
+          "location" : [ 15, 13, 15, 30 ],
+          "value" : {
+            "kind" : "MethodCallExpr",
+            "location" : [ 15, 20, 15, 30 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "method" : {
+              "kind" : "MemberExpr",
+              "location" : [ 15, 20, 15, 27 ],
+              "inferredType" : {
+                "kind" : "FuncType",
+                "parameters" : [ {
+                  "kind" : "ClassValueType",
+                  "className" : "A"
+                }, {
+                  "kind" : "ClassValueType",
+                  "className" : "object"
+                } ],
+                "returnType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "int"
+                }
+              },
+              "object" : {
+                "kind" : "Identifier",
+                "location" : [ 15, 20, 15, 23 ],
+                "inferredType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "B"
+                },
+                "name" : "self"
+              },
+              "member" : {
+                "kind" : "Identifier",
+                "location" : [ 15, 25, 15, 27 ],
+                "name" : "foo"
+              }
+            },
+            "args" : [ {
+              "kind" : "Identifier",
+              "location" : [ 15, 29, 15, 29 ],
+              "inferredType" : {
+                "kind" : "ClassValueType",
+                "className" : "bool"
+              },
+              "name" : "p"
+            } ]
+          }
+        } ]
+      } ],
+      "statements" : [ {
+        "kind" : "ReturnStmt",
+        "location" : [ 16, 9, 16, 24 ],
+        "value" : {
+          "kind" : "CallExpr",
+          "location" : [ 16, 16, 16, 24 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 16, 16, 16, 18 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "bool"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            },
+            "name" : "qux"
+          },
+          "args" : [ {
+            "kind" : "BooleanLiteral",
+            "location" : [ 16, 20, 16, 23 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "bool"
+            },
+            "value" : true
+          } ]
+        }
+      } ]
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 18, 1, 18, 16 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 18, 1, 18, 16 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 18, 1, 18, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MethodCallExpr",
+        "location" : [ 18, 7, 18, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "method" : {
+          "kind" : "MemberExpr",
+          "location" : [ 18, 7, 18, 13 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "B"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "object" : {
+            "kind" : "CallExpr",
+            "location" : [ 18, 7, 18, 9 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "B"
+            },
+            "function" : {
+              "kind" : "Identifier",
+              "location" : [ 18, 7, 18, 7 ],
+              "name" : "B"
+            },
+            "args" : [ ]
+          },
+          "member" : {
+            "kind" : "Identifier",
+            "location" : [ 18, 11, 18, 13 ],
+            "name" : "bar"
+          }
+        },
+        "args" : [ ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_method_nested.py.ast.typed.s.result b/pa3-tests/core/object_method_nested.py.ast.typed.s.result
new file mode 100644
index 0000000..418c69b
--- /dev/null
+++ b/pa3-tests/core/object_method_nested.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+B
+42
diff --git a/pa3-tests/core/object_method_none.py b/pa3-tests/core/object_method_none.py
new file mode 100644
index 0000000..cd50666
--- /dev/null
+++ b/pa3-tests/core/object_method_none.py
@@ -0,0 +1,17 @@
+class A(object):
+    a:int = 42
+
+    def foo(self:"A", ignore:object) -> int:
+        return self.a
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+    def bar(self:"B") -> int:
+        a:A = None
+        return a.foo(self.b)
+
+print(B().bar())
diff --git a/pa3-tests/core/object_method_none.py.ast.typed b/pa3-tests/core/object_method_none.py.ast.typed
new file mode 100644
index 0000000..db92330
--- /dev/null
+++ b/pa3-tests/core/object_method_none.py.ast.typed
@@ -0,0 +1,412 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 17, 17 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 7, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 4, 5, 5, 22 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 9, 4, 11 ],
+        "name" : "foo"
+      },
+      "params" : [ {
+        "kind" : "TypedVar",
+        "location" : [ 4, 13, 4, 20 ],
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+              "name" : "B"
+            },
+            "args" : [ ]
+          },
+          "member" : {
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+            "location" : [ 17, 11, 17, 13 ],
+            "name" : "bar"
+          }
+        },
+        "args" : [ ]
+      } ]
+    }
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+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_method_none.py.ast.typed.s.result b/pa3-tests/core/object_method_none.py.ast.typed.s.result
new file mode 100644
index 0000000..d9d147e
--- /dev/null
+++ b/pa3-tests/core/object_method_none.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+B
+Operation on None
+Exited with error code 4
diff --git a/pa3-tests/core/object_method_override.py b/pa3-tests/core/object_method_override.py
new file mode 100644
index 0000000..879b2ba
--- /dev/null
+++ b/pa3-tests/core/object_method_override.py
@@ -0,0 +1,19 @@
+class A(object):
+    a:int = 42
+
+    def foo(self:"A", ignore:object) -> int:
+        return self.a
+
+class B(A):
+    b:bool = True
+
+    def __init__(self:"B"):
+        print("B")
+
+    def bar(self:"B") -> int:
+        return self.foo(self.b)
+
+    def foo(self:"B", ignore:object) -> int:
+        return 1
+
+print(B().bar())
diff --git a/pa3-tests/core/object_method_override.py.ast.typed b/pa3-tests/core/object_method_override.py.ast.typed
new file mode 100644
index 0000000..5684f7d
--- /dev/null
+++ b/pa3-tests/core/object_method_override.py.ast.typed
@@ -0,0 +1,441 @@
+{
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+    "name" : {
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+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
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+      "name" : "object"
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+          "className" : "int"
+        }
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+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    }, {
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+      "name" : {
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+        "name" : "foo"
+      },
+      "params" : [ {
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+        "location" : [ 4, 13, 4, 20 ],
+        "identifier" : {
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+          "location" : [ 4, 13, 4, 16 ],
+          "name" : "self"
+        },
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+          "location" : [ 4, 18, 4, 20 ],
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+        }
+      }, {
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+        "location" : [ 4, 23, 4, 35 ],
+        "identifier" : {
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+            },
+            "name" : "self"
+          },
+          "member" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 21, 5, 21 ],
+            "name" : "a"
+          }
+        }
+      } ]
+    } ]
+  }, {
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+    },
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+          "className" : "bool"
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+            "className" : "int"
+          },
+          "value" : 1
+        }
+      } ]
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 19, 1, 19, 16 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 19, 1, 19, 16 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 19, 1, 19, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "MethodCallExpr",
+        "location" : [ 19, 7, 19, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "method" : {
+          "kind" : "MemberExpr",
+          "location" : [ 19, 7, 19, 13 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "B"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "object" : {
+            "kind" : "CallExpr",
+            "location" : [ 19, 7, 19, 9 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "B"
+            },
+            "function" : {
+              "kind" : "Identifier",
+              "location" : [ 19, 7, 19, 7 ],
+              "name" : "B"
+            },
+            "args" : [ ]
+          },
+          "member" : {
+            "kind" : "Identifier",
+            "location" : [ 19, 11, 19, 13 ],
+            "name" : "bar"
+          }
+        },
+        "args" : [ ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/object_method_override.py.ast.typed.s.result b/pa3-tests/core/object_method_override.py.ast.typed.s.result
new file mode 100644
index 0000000..9a6e55a
--- /dev/null
+++ b/pa3-tests/core/object_method_override.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+B
+1
diff --git a/pa3-tests/core/op_add.py b/pa3-tests/core/op_add.py
new file mode 100644
index 0000000..95e89ae
--- /dev/null
+++ b/pa3-tests/core/op_add.py
@@ -0,0 +1 @@
+print(1 + 100)
diff --git a/pa3-tests/core/op_add.py.ast.typed b/pa3-tests/core/op_add.py.ast.typed
new file mode 100644
index 0000000..a0a2d9b
--- /dev/null
+++ b/pa3-tests/core/op_add.py.ast.typed
@@ -0,0 +1,65 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 15 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 14 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 1, 7, 1, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 7, 1, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 11, 1, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 100
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/op_add.py.ast.typed.s.result b/pa3-tests/core/op_add.py.ast.typed.s.result
new file mode 100644
index 0000000..398050c
--- /dev/null
+++ b/pa3-tests/core/op_add.py.ast.typed.s.result
@@ -0,0 +1 @@
+101
diff --git a/pa3-tests/core/op_cmp_bool.py b/pa3-tests/core/op_cmp_bool.py
new file mode 100644
index 0000000..7f8d4b5
--- /dev/null
+++ b/pa3-tests/core/op_cmp_bool.py
@@ -0,0 +1,8 @@
+print(True == True)
+print(True == False)
+print(False == True)
+print(False == False)
+print(True != True)
+print(True != False)
+print(False != True)
+print(False != False)
diff --git a/pa3-tests/core/op_cmp_bool.py.ast.typed b/pa3-tests/core/op_cmp_bool.py.ast.typed
new file mode 100644
index 0000000..4c25364
--- /dev/null
+++ b/pa3-tests/core/op_cmp_bool.py.ast.typed
@@ -0,0 +1,443 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 8, 22 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 19 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 19 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 1, 7, 1, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 1, 7, 1, 10 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        },
+        "operator" : "==",
+        "right" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 1, 15, 1, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 2, 1, 2, 20 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 2, 1, 2, 20 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 2, 7, 2, 19 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 2, 7, 2, 10 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        },
+        "operator" : "==",
+        "right" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 2, 15, 2, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 3, 1, 3, 20 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 3, 1, 3, 20 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 3, 7, 3, 19 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 3, 7, 3, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        },
+        "operator" : "==",
+        "right" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 3, 16, 3, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 21 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 21 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 4, 7, 4, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 4, 7, 4, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        },
+        "operator" : "==",
+        "right" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 4, 16, 4, 20 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 5, 1, 5, 19 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 5, 1, 5, 19 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 1, 5, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 5, 7, 5, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 5, 7, 5, 10 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        },
+        "operator" : "!=",
+        "right" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 5, 15, 5, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 6, 1, 6, 20 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 6, 1, 6, 20 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 6, 1, 6, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 6, 7, 6, 19 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 6, 7, 6, 10 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        },
+        "operator" : "!=",
+        "right" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 6, 15, 6, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 7, 1, 7, 20 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 7, 1, 7, 20 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 1, 7, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 7, 7, 7, 19 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 7, 7, 7, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        },
+        "operator" : "!=",
+        "right" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 7, 16, 7, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 8, 1, 8, 21 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 8, 1, 8, 21 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 1, 8, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 8, 7, 8, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 8, 7, 8, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        },
+        "operator" : "!=",
+        "right" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 8, 16, 8, 20 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : false
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/op_cmp_bool.py.ast.typed.s.result b/pa3-tests/core/op_cmp_bool.py.ast.typed.s.result
new file mode 100644
index 0000000..12ea2d4
--- /dev/null
+++ b/pa3-tests/core/op_cmp_bool.py.ast.typed.s.result
@@ -0,0 +1,8 @@
+True
+False
+False
+True
+False
+True
+True
+False
diff --git a/pa3-tests/core/op_cmp_int.py b/pa3-tests/core/op_cmp_int.py
new file mode 100644
index 0000000..fd70a09
--- /dev/null
+++ b/pa3-tests/core/op_cmp_int.py
@@ -0,0 +1,16 @@
+x:int = 42
+y:int = 7
+
+print(x == y)
+print(x != y)
+print(x < y)
+print(x <= y)
+print(x > y)
+print(x >= y)
+
+print(x == x)
+print(x != x)
+print(x < x)
+print(x <= x)
+print(x > x)
+print(x >= x)
diff --git a/pa3-tests/core/op_cmp_int.py.ast.typed b/pa3-tests/core/op_cmp_int.py.ast.typed
new file mode 100644
index 0000000..4b3633f
--- /dev/null
+++ b/pa3-tests/core/op_cmp_int.py.ast.typed
@@ -0,0 +1,711 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 16, 14 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 42
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 2, 9, 2, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 7
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
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+        },
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+          },
+          "name" : "x"
+        }
+      } ]
+    }
+  } ],
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diff --git a/pa3-tests/core/op_cmp_int.py.ast.typed.s.result b/pa3-tests/core/op_cmp_int.py.ast.typed.s.result
new file mode 100644
index 0000000..4386d2a
--- /dev/null
+++ b/pa3-tests/core/op_cmp_int.py.ast.typed.s.result
@@ -0,0 +1,12 @@
+False
+True
+False
+False
+True
+True
+True
+False
+False
+True
+False
+True
diff --git a/pa3-tests/core/op_div_mod.py b/pa3-tests/core/op_div_mod.py
new file mode 100644
index 0000000..9e41a78
--- /dev/null
+++ b/pa3-tests/core/op_div_mod.py
@@ -0,0 +1,5 @@
+x:int = 42
+y:int = 9
+
+print(x // y)
+print(x % y)
diff --git a/pa3-tests/core/op_div_mod.py.ast.typed b/pa3-tests/core/op_div_mod.py.ast.typed
new file mode 100644
index 0000000..eded4a3
--- /dev/null
+++ b/pa3-tests/core/op_div_mod.py.ast.typed
@@ -0,0 +1,171 @@
+{
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+  "location" : [ 1, 1, 5, 13 ],
+  "declarations" : [ {
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+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
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+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
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+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
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+      "inferredType" : {
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+        "className" : "int"
+      },
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+    }
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+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "int"
+      }
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+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 2, 9, 2, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 9
+    }
+  } ],
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+      "location" : [ 5, 1, 5, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 1, 5, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 5, 7, 5, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 7, 5, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        },
+        "operator" : "%",
+        "right" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 11, 5, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "y"
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/op_div_mod.py.ast.typed.s.result b/pa3-tests/core/op_div_mod.py.ast.typed.s.result
new file mode 100644
index 0000000..cfbeb15
--- /dev/null
+++ b/pa3-tests/core/op_div_mod.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+4
+6
diff --git a/pa3-tests/core/op_is.py b/pa3-tests/core/op_is.py
new file mode 100644
index 0000000..4207f29
--- /dev/null
+++ b/pa3-tests/core/op_is.py
@@ -0,0 +1,19 @@
+class A(object):
+    a:int = 42
+
+a1:A = None
+a2:A = None
+a3:A = None
+a4:A = None
+
+a1 = A()
+a2 = a1
+a3 = A()
+
+print(a1 is a1)
+print(a1 is a2)
+print(a1 is a3)
+print(a1 is a4)
+print(a1 is None)
+print(a4 is None)
+print(None is None)
diff --git a/pa3-tests/core/op_is.py.ast.typed b/pa3-tests/core/op_is.py.ast.typed
new file mode 100644
index 0000000..962be5e
--- /dev/null
+++ b/pa3-tests/core/op_is.py.ast.typed
@@ -0,0 +1,598 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 19, 20 ],
+  "declarations" : [ {
+    "kind" : "ClassDef",
+    "location" : [ 1, 1, 2, 15 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 7, 1, 7 ],
+      "name" : "A"
+    },
+    "superClass" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 9, 1, 14 ],
+      "name" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 14 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "a"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 42
+      }
+    } ]
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 4, 1, 4, 11 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 4, 1, 4, 4 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 2 ],
+        "name" : "a1"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 4, 4, 4 ],
+        "className" : "A"
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 4, 8, 4, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 5, 1, 5, 11 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 5, 1, 5, 4 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 1, 5, 2 ],
+        "name" : "a2"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 5, 4, 5, 4 ],
+        "className" : "A"
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 5, 8, 5, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 6, 1, 6, 11 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 6, 1, 6, 4 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 6, 1, 6, 2 ],
+        "name" : "a3"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 6, 4, 6, 4 ],
+        "className" : "A"
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 6, 8, 6, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 7, 1, 7, 11 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 7, 1, 7, 4 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 1, 7, 2 ],
+        "name" : "a4"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 7, 4, 7, 4 ],
+        "className" : "A"
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 7, 8, 7, 11 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 9, 1, 9, 8 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 9, 1, 9, 2 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "A"
+      },
+      "name" : "a1"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 9, 6, 9, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "A"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 9, 6, 9, 6 ],
+        "name" : "A"
+      },
+      "args" : [ ]
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 10, 1, 10, 7 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 10, 1, 10, 2 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "A"
+      },
+      "name" : "a2"
+    } ],
+    "value" : {
+      "kind" : "Identifier",
+      "location" : [ 10, 6, 10, 7 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "A"
+      },
+      "name" : "a1"
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 11, 1, 11, 8 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 11, 1, 11, 2 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "A"
+      },
+      "name" : "a3"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 11, 6, 11, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "A"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 6, 11, 6 ],
+        "name" : "A"
+      },
+      "args" : [ ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 13, 1, 13, 15 ],
+    "expr" : {
+      "kind" : "CallExpr",
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+        "className" : "<None>"
+      },
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+            "kind" : "ClassValueType",
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+          } ],
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+          }
+        },
+        "name" : "print"
+      },
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+          },
+          "name" : "a1"
+        },
+        "operator" : "is",
+        "right" : {
+          "kind" : "Identifier",
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+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "A"
+          },
+          "name" : "a1"
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 14, 1, 14, 15 ],
+    "expr" : {
+      "kind" : "CallExpr",
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+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 14, 1, 14, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
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+        },
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+            "className" : "A"
+          },
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+        },
+        "operator" : "is",
+        "right" : {
+          "kind" : "Identifier",
+          "location" : [ 14, 13, 14, 14 ],
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+          },
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+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 15, 1, 15, 15 ],
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+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 15, 1, 15, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
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+          },
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+        },
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+          },
+          "name" : "a3"
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 16, 1, 16, 15 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 16, 1, 16, 15 ],
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+        "className" : "<None>"
+      },
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+          } ],
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+          },
+          "name" : "a1"
+        },
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+        "right" : {
+          "kind" : "Identifier",
+          "location" : [ 16, 13, 16, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "A"
+          },
+          "name" : "a4"
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 17, 1, 17, 17 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 17, 1, 17, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 17, 1, 17, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
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+        "inferredType" : {
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+        },
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+            "className" : "A"
+          },
+          "name" : "a1"
+        },
+        "operator" : "is",
+        "right" : {
+          "kind" : "NoneLiteral",
+          "location" : [ 17, 13, 17, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 18, 1, 18, 17 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 18, 1, 18, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
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+          } ],
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+        },
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+          }
+        }
+      } ]
+    }
+  }, {
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+    "expr" : {
+      "kind" : "CallExpr",
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+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 19, 1, 19, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 19, 7, 19, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "NoneLiteral",
+          "location" : [ 19, 7, 19, 10 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "operator" : "is",
+        "right" : {
+          "kind" : "NoneLiteral",
+          "location" : [ 19, 15, 19, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/op_is.py.ast.typed.s.result b/pa3-tests/core/op_is.py.ast.typed.s.result
new file mode 100644
index 0000000..0ac4f5b
--- /dev/null
+++ b/pa3-tests/core/op_is.py.ast.typed.s.result
@@ -0,0 +1,7 @@
+True
+True
+False
+False
+False
+True
+True
diff --git a/pa3-tests/core/op_logical.py b/pa3-tests/core/op_logical.py
new file mode 100644
index 0000000..7b55262
--- /dev/null
+++ b/pa3-tests/core/op_logical.py
@@ -0,0 +1,13 @@
+def f() -> bool:
+  print("f called")
+  return True
+
+def g() -> bool:
+  print("g called")
+  return False
+
+if f() or g():      # Short-circuit
+  if g() and f():   # Short-circuit
+    print("Never")
+  else:
+    print(not (f() and (g() or f())))
diff --git a/pa3-tests/core/op_logical.py.ast.typed b/pa3-tests/core/op_logical.py.ast.typed
new file mode 100644
index 0000000..4aa1544
--- /dev/null
+++ b/pa3-tests/core/op_logical.py.ast.typed
@@ -0,0 +1,411 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 14, 2 ],
+  "declarations" : [ {
+    "kind" : "FuncDef",
+    "location" : [ 1, 1, 3, 14 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 5, 1, 5 ],
+      "name" : "f"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 1, 12, 1, 15 ],
+      "className" : "bool"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 2, 3, 2, 19 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 2, 3, 2, 19 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 3, 2, 7 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 2, 9, 2, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "f called"
+        } ]
+      }
+    }, {
+      "kind" : "ReturnStmt",
+      "location" : [ 3, 3, 3, 13 ],
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 3, 10, 3, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      }
+    } ]
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 5, 1, 7, 15 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 5, 5, 5, 5 ],
+      "name" : "g"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 5, 12, 5, 15 ],
+      "className" : "bool"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 6, 3, 6, 19 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 6, 3, 6, 19 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 3, 6, 7 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 6, 9, 6, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "g called"
+        } ]
+      }
+    }, {
+      "kind" : "ReturnStmt",
+      "location" : [ 7, 3, 7, 14 ],
+      "value" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 7, 10, 7, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : false
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "IfStmt",
+    "location" : [ 9, 1, 14, 2 ],
+    "condition" : {
+      "kind" : "BinaryExpr",
+      "location" : [ 9, 4, 9, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "bool"
+      },
+      "left" : {
+        "kind" : "CallExpr",
+        "location" : [ 9, 4, 9, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 9, 4, 9, 4 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "bool"
+            }
+          },
+          "name" : "f"
+        },
+        "args" : [ ]
+      },
+      "operator" : "or",
+      "right" : {
+        "kind" : "CallExpr",
+        "location" : [ 9, 11, 9, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 9, 11, 9, 11 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "bool"
+            }
+          },
+          "name" : "g"
+        },
+        "args" : [ ]
+      }
+    },
+    "thenBody" : [ {
+      "kind" : "IfStmt",
+      "location" : [ 10, 3, 14, 1 ],
+      "condition" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 10, 6, 10, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "CallExpr",
+          "location" : [ 10, 6, 10, 8 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 10, 6, 10, 6 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "bool"
+              }
+            },
+            "name" : "g"
+          },
+          "args" : [ ]
+        },
+        "operator" : "and",
+        "right" : {
+          "kind" : "CallExpr",
+          "location" : [ 10, 14, 10, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 10, 14, 10, 14 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "bool"
+              }
+            },
+            "name" : "f"
+          },
+          "args" : [ ]
+        }
+      },
+      "thenBody" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 11, 5, 11, 18 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 11, 5, 11, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 11, 5, 11, 9 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "StringLiteral",
+            "location" : [ 11, 11, 11, 17 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "value" : "Never"
+          } ]
+        }
+      } ],
+      "elseBody" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 13, 5, 13, 37 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 13, 5, 13, 37 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 13, 5, 13, 9 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "UnaryExpr",
+            "location" : [ 13, 11, 13, 36 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "bool"
+            },
+            "operator" : "not",
+            "operand" : {
+              "kind" : "BinaryExpr",
+              "location" : [ 13, 16, 13, 35 ],
+              "inferredType" : {
+                "kind" : "ClassValueType",
+                "className" : "bool"
+              },
+              "left" : {
+                "kind" : "CallExpr",
+                "location" : [ 13, 16, 13, 18 ],
+                "inferredType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "bool"
+                },
+                "function" : {
+                  "kind" : "Identifier",
+                  "location" : [ 13, 16, 13, 16 ],
+                  "inferredType" : {
+                    "kind" : "FuncType",
+                    "parameters" : [ ],
+                    "returnType" : {
+                      "kind" : "ClassValueType",
+                      "className" : "bool"
+                    }
+                  },
+                  "name" : "f"
+                },
+                "args" : [ ]
+              },
+              "operator" : "and",
+              "right" : {
+                "kind" : "BinaryExpr",
+                "location" : [ 13, 25, 13, 34 ],
+                "inferredType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "bool"
+                },
+                "left" : {
+                  "kind" : "CallExpr",
+                  "location" : [ 13, 25, 13, 27 ],
+                  "inferredType" : {
+                    "kind" : "ClassValueType",
+                    "className" : "bool"
+                  },
+                  "function" : {
+                    "kind" : "Identifier",
+                    "location" : [ 13, 25, 13, 25 ],
+                    "inferredType" : {
+                      "kind" : "FuncType",
+                      "parameters" : [ ],
+                      "returnType" : {
+                        "kind" : "ClassValueType",
+                        "className" : "bool"
+                      }
+                    },
+                    "name" : "g"
+                  },
+                  "args" : [ ]
+                },
+                "operator" : "or",
+                "right" : {
+                  "kind" : "CallExpr",
+                  "location" : [ 13, 32, 13, 34 ],
+                  "inferredType" : {
+                    "kind" : "ClassValueType",
+                    "className" : "bool"
+                  },
+                  "function" : {
+                    "kind" : "Identifier",
+                    "location" : [ 13, 32, 13, 32 ],
+                    "inferredType" : {
+                      "kind" : "FuncType",
+                      "parameters" : [ ],
+                      "returnType" : {
+                        "kind" : "ClassValueType",
+                        "className" : "bool"
+                      }
+                    },
+                    "name" : "f"
+                  },
+                  "args" : [ ]
+                }
+              }
+            }
+          } ]
+        }
+      } ]
+    } ],
+    "elseBody" : [ ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/op_logical.py.ast.typed.s.result b/pa3-tests/core/op_logical.py.ast.typed.s.result
new file mode 100644
index 0000000..82c1ab2
--- /dev/null
+++ b/pa3-tests/core/op_logical.py.ast.typed.s.result
@@ -0,0 +1,6 @@
+f called
+g called
+f called
+g called
+f called
+False
diff --git a/pa3-tests/core/op_mul.py b/pa3-tests/core/op_mul.py
new file mode 100644
index 0000000..cf6201d
--- /dev/null
+++ b/pa3-tests/core/op_mul.py
@@ -0,0 +1 @@
+print(6*9*2)
diff --git a/pa3-tests/core/op_mul.py.ast.typed b/pa3-tests/core/op_mul.py.ast.typed
new file mode 100644
index 0000000..6ed26cc
--- /dev/null
+++ b/pa3-tests/core/op_mul.py.ast.typed
@@ -0,0 +1,83 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 13 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 12 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 1, 7, 1, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "BinaryExpr",
+          "location" : [ 1, 7, 1, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "left" : {
+            "kind" : "IntegerLiteral",
+            "location" : [ 1, 7, 1, 7 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 6
+          },
+          "operator" : "*",
+          "right" : {
+            "kind" : "IntegerLiteral",
+            "location" : [ 1, 9, 1, 9 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 9
+          }
+        },
+        "operator" : "*",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 11, 1, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 2
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/op_mul.py.ast.typed.s.result b/pa3-tests/core/op_mul.py.ast.typed.s.result
new file mode 100644
index 0000000..3b20426
--- /dev/null
+++ b/pa3-tests/core/op_mul.py.ast.typed.s.result
@@ -0,0 +1 @@
+108
diff --git a/pa3-tests/core/op_negate.py b/pa3-tests/core/op_negate.py
new file mode 100644
index 0000000..0f3b2be
--- /dev/null
+++ b/pa3-tests/core/op_negate.py
@@ -0,0 +1,2 @@
+x:int = 42
+print(-x)
diff --git a/pa3-tests/core/op_negate.py.ast.typed b/pa3-tests/core/op_negate.py.ast.typed
new file mode 100644
index 0000000..4268b3b
--- /dev/null
+++ b/pa3-tests/core/op_negate.py.ast.typed
@@ -0,0 +1,82 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 2, 10 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 42
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 2, 1, 2, 9 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 2, 1, 2, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "UnaryExpr",
+        "location" : [ 2, 7, 2, 8 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "operator" : "-",
+        "operand" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 8, 2, 8 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/op_negate.py.ast.typed.s.result b/pa3-tests/core/op_negate.py.ast.typed.s.result
new file mode 100644
index 0000000..6a0e60d
--- /dev/null
+++ b/pa3-tests/core/op_negate.py.ast.typed.s.result
@@ -0,0 +1 @@
+-42
diff --git a/pa3-tests/core/op_sub.py b/pa3-tests/core/op_sub.py
new file mode 100644
index 0000000..48aa45b
--- /dev/null
+++ b/pa3-tests/core/op_sub.py
@@ -0,0 +1 @@
+print(1 - 100)
diff --git a/pa3-tests/core/op_sub.py.ast.typed b/pa3-tests/core/op_sub.py.ast.typed
new file mode 100644
index 0000000..2c927e8
--- /dev/null
+++ b/pa3-tests/core/op_sub.py.ast.typed
@@ -0,0 +1,65 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 15 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 14 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 1, 7, 1, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 7, 1, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        },
+        "operator" : "-",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 1, 11, 1, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 100
+        }
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/op_sub.py.ast.typed.s.result b/pa3-tests/core/op_sub.py.ast.typed.s.result
new file mode 100644
index 0000000..d3a0ef5
--- /dev/null
+++ b/pa3-tests/core/op_sub.py.ast.typed.s.result
@@ -0,0 +1 @@
+-99
diff --git a/pa3-tests/core/pass.py b/pa3-tests/core/pass.py
new file mode 100644
index 0000000..2ae2839
--- /dev/null
+++ b/pa3-tests/core/pass.py
@@ -0,0 +1 @@
+pass
diff --git a/pa3-tests/core/pass.py.ast.typed b/pa3-tests/core/pass.py.ast.typed
new file mode 100644
index 0000000..ceb0bbd
--- /dev/null
+++ b/pa3-tests/core/pass.py.ast.typed
@@ -0,0 +1,11 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 5 ],
+  "declarations" : [ ],
+  "statements" : [ ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/pass.py.ast.typed.s.result b/pa3-tests/core/pass.py.ast.typed.s.result
new file mode 100644
index 0000000..e69de29
diff --git a/pa3-tests/core/predef_constructors.py b/pa3-tests/core/predef_constructors.py
new file mode 100644
index 0000000..0086564
--- /dev/null
+++ b/pa3-tests/core/predef_constructors.py
@@ -0,0 +1,4 @@
+print(object() is None)
+print(int())
+print(str())
+print(bool())
diff --git a/pa3-tests/core/predef_constructors.py.ast.typed b/pa3-tests/core/predef_constructors.py.ast.typed
new file mode 100644
index 0000000..3644f24
--- /dev/null
+++ b/pa3-tests/core/predef_constructors.py.ast.typed
@@ -0,0 +1,192 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 14 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 23 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 23 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "BinaryExpr",
+        "location" : [ 1, 7, 1, 22 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "left" : {
+          "kind" : "CallExpr",
+          "location" : [ 1, 7, 1, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 1, 7, 1, 12 ],
+            "name" : "object"
+          },
+          "args" : [ ]
+        },
+        "operator" : "is",
+        "right" : {
+          "kind" : "NoneLiteral",
+          "location" : [ 1, 19, 1, 22 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 2, 1, 2, 12 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 2, 1, 2, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 2, 7, 2, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 7, 2, 9 ],
+          "name" : "int"
+        },
+        "args" : [ ]
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 3, 1, 3, 12 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 3, 1, 3, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 3, 7, 3, 11 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 7, 3, 9 ],
+          "name" : "str"
+        },
+        "args" : [ ]
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 13 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 4, 7, 4, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 7, 4, 10 ],
+          "name" : "bool"
+        },
+        "args" : [ ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/predef_constructors.py.ast.typed.s.result b/pa3-tests/core/predef_constructors.py.ast.typed.s.result
new file mode 100644
index 0000000..8add9b0
--- /dev/null
+++ b/pa3-tests/core/predef_constructors.py.ast.typed.s.result
@@ -0,0 +1,4 @@
+False
+0
+
+False
diff --git a/pa3-tests/core/stmt_for_list.py b/pa3-tests/core/stmt_for_list.py
new file mode 100644
index 0000000..78c5c00
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list.py
@@ -0,0 +1,7 @@
+x:int = 0
+z:[int] = None
+
+z = [1, 2, 3]
+
+for x in z:
+    print(x)
diff --git a/pa3-tests/core/stmt_for_list.py.ast.typed b/pa3-tests/core/stmt_for_list.py.ast.typed
new file mode 100644
index 0000000..53d6834
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list.py.ast.typed
@@ -0,0 +1,178 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 8, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 2, 3, 2, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 4, 2, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 2, 11, 2, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 4, 1, 4, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 4, 1, 4, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 4, 5, 4, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 6, 4, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 9, 4, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 12, 4, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ForStmt",
+    "location" : [ 6, 1, 8, 1 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 6, 5, 6, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 6, 10, 6, 10 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 7, 5, 7, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 7, 5, 7, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 5, 7, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 7, 11, 7, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list.py.ast.typed.s.result
new file mode 100644
index 0000000..01e79c3
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+1
+2
+3
diff --git a/pa3-tests/core/stmt_for_list_empty.py b/pa3-tests/core/stmt_for_list_empty.py
new file mode 100644
index 0000000..23fba4a
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_empty.py
@@ -0,0 +1,12 @@
+x:int = 0
+y:int = 0
+z:[int] = None
+e:[int] = None
+
+z = [1,2,3]
+e = []
+
+for x in z:
+    for y in e:
+        print("Never")
+    print(x)
diff --git a/pa3-tests/core/stmt_for_list_empty.py.ast.typed b/pa3-tests/core/stmt_for_list_empty.py.ast.typed
new file mode 100644
index 0000000..ca4160c
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_empty.py.ast.typed
@@ -0,0 +1,318 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 13, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 2, 9, 2, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 3, 1, 3, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 3, 1, 3, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 3, 3, 3, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 3, 4, 3, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 3, 11, 3, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 4, 1, 4, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 4, 1, 4, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 1 ],
+        "name" : "e"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 4, 3, 4, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 4, 4, 4, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 4, 11, 4, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 6, 1, 6, 11 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 6, 1, 6, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 6, 5, 6, 11 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 6, 6, 6, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 6, 8, 6, 8 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 6, 10, 6, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 7, 1, 7, 6 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 7, 1, 7, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "e"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 7, 5, 7, 6 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<Empty>"
+      },
+      "elements" : [ ]
+    }
+  }, {
+    "kind" : "ForStmt",
+    "location" : [ 9, 1, 13, 1 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 9, 5, 9, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 9, 10, 9, 10 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "ForStmt",
+      "location" : [ 10, 5, 12, 4 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 10, 9, 10, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "y"
+      },
+      "iterable" : {
+        "kind" : "Identifier",
+        "location" : [ 10, 14, 10, 14 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "e"
+      },
+      "body" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 11, 9, 11, 22 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 11, 9, 11, 22 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 11, 9, 11, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "StringLiteral",
+            "location" : [ 11, 15, 11, 21 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "value" : "Never"
+          } ]
+        }
+      } ]
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 12, 5, 12, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 12, 5, 12, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 12, 5, 12, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 12, 11, 12, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list_empty.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list_empty.py.ast.typed.s.result
new file mode 100644
index 0000000..01e79c3
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_empty.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+1
+2
+3
diff --git a/pa3-tests/core/stmt_for_list_eval.py b/pa3-tests/core/stmt_for_list_eval.py
new file mode 100644
index 0000000..a77b171
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_eval.py
@@ -0,0 +1,8 @@
+x:int = 0
+z:[int] = None
+
+z = [1, 2, 3]
+
+for x in z:
+    z = []
+    print(x)
diff --git a/pa3-tests/core/stmt_for_list_eval.py.ast.typed b/pa3-tests/core/stmt_for_list_eval.py.ast.typed
new file mode 100644
index 0000000..c86d718
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_eval.py.ast.typed
@@ -0,0 +1,202 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 9, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 2, 3, 2, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 4, 2, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 2, 11, 2, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 4, 1, 4, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 4, 1, 4, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 4, 5, 4, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 6, 4, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 9, 4, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 12, 4, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ForStmt",
+    "location" : [ 6, 1, 9, 1 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 6, 5, 6, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 6, 10, 6, 10 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "AssignStmt",
+      "location" : [ 7, 5, 7, 10 ],
+      "targets" : [ {
+        "kind" : "Identifier",
+        "location" : [ 7, 5, 7, 5 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "z"
+      } ],
+      "value" : {
+        "kind" : "ListExpr",
+        "location" : [ 7, 9, 7, 10 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<Empty>"
+        },
+        "elements" : [ ]
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 8, 5, 8, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 8, 5, 8, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 8, 5, 8, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 8, 11, 8, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list_eval.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list_eval.py.ast.typed.s.result
new file mode 100644
index 0000000..01e79c3
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_eval.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+1
+2
+3
diff --git a/pa3-tests/core/stmt_for_list_modify.py b/pa3-tests/core/stmt_for_list_modify.py
new file mode 100644
index 0000000..3006cd2
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_modify.py
@@ -0,0 +1,8 @@
+x:int = 0
+z:[int] = None
+
+z = [1, 2, 1]
+
+for x in z:
+    z[x] = x
+    print(x)
diff --git a/pa3-tests/core/stmt_for_list_modify.py.ast.typed b/pa3-tests/core/stmt_for_list_modify.py.ast.typed
new file mode 100644
index 0000000..fa19b60
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_modify.py.ast.typed
@@ -0,0 +1,219 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 9, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 2, 3, 2, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 4, 2, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 2, 11, 2, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 4, 1, 4, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 4, 1, 4, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 4, 5, 4, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 6, 4, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 9, 4, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 12, 4, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      } ]
+    }
+  }, {
+    "kind" : "ForStmt",
+    "location" : [ 6, 1, 9, 1 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 6, 5, 6, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 6, 10, 6, 10 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "AssignStmt",
+      "location" : [ 7, 5, 7, 12 ],
+      "targets" : [ {
+        "kind" : "IndexExpr",
+        "location" : [ 7, 5, 7, 8 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 5, 7, 5 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "z"
+        },
+        "index" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 7, 7, 7 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        }
+      } ],
+      "value" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 12, 7, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 8, 5, 8, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 8, 5, 8, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 8, 5, 8, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 8, 11, 8, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list_modify.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list_modify.py.ast.typed.s.result
new file mode 100644
index 0000000..e8183f0
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_modify.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+1
+1
+1
diff --git a/pa3-tests/core/stmt_for_list_nested.py b/pa3-tests/core/stmt_for_list_nested.py
new file mode 100644
index 0000000..b69f3f0
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nested.py
@@ -0,0 +1,9 @@
+x:int = 0
+y:int = 0
+z:[int] = None
+
+z = [1, 2, 3]
+
+for x in z:
+    for y in z:
+        print(x * y)
diff --git a/pa3-tests/core/stmt_for_list_nested.py.ast.typed b/pa3-tests/core/stmt_for_list_nested.py.ast.typed
new file mode 100644
index 0000000..0521e4a
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nested.py.ast.typed
@@ -0,0 +1,247 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 10, 2 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 2, 9, 2, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 3, 1, 3, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 3, 1, 3, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 3, 3, 3, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 3, 4, 3, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 3, 11, 3, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 5, 1, 5, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 5, 1, 5, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 5, 5, 5, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 5, 6, 5, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 5, 9, 5, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 5, 12, 5, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ForStmt",
+    "location" : [ 7, 1, 10, 2 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 5, 7, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 10, 7, 10 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "ForStmt",
+      "location" : [ 8, 5, 10, 1 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 9, 8, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "y"
+      },
+      "iterable" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 14, 8, 14 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "z"
+      },
+      "body" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 9, 9, 9, 20 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 9, 9, 9, 20 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 9, 9, 9, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "BinaryExpr",
+            "location" : [ 9, 15, 9, 19 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "left" : {
+              "kind" : "Identifier",
+              "location" : [ 9, 15, 9, 15 ],
+              "inferredType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              },
+              "name" : "x"
+            },
+            "operator" : "*",
+            "right" : {
+              "kind" : "Identifier",
+              "location" : [ 9, 19, 9, 19 ],
+              "inferredType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              },
+              "name" : "y"
+            }
+          } ]
+        }
+      } ]
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list_nested.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list_nested.py.ast.typed.s.result
new file mode 100644
index 0000000..0d1fb9e
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nested.py.ast.typed.s.result
@@ -0,0 +1,9 @@
+1
+2
+3
+2
+4
+6
+3
+6
+9
diff --git a/pa3-tests/core/stmt_for_list_nested_same_var.py b/pa3-tests/core/stmt_for_list_nested_same_var.py
new file mode 100644
index 0000000..0057164
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nested_same_var.py
@@ -0,0 +1,9 @@
+x:int = 0
+y:int = 0
+z:[int] = None
+
+z = [1, 2, 3]
+
+for x in z:
+    for x in z:
+        print(x)
diff --git a/pa3-tests/core/stmt_for_list_nested_same_var.py.ast.typed b/pa3-tests/core/stmt_for_list_nested_same_var.py.ast.typed
new file mode 100644
index 0000000..2feac51
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nested_same_var.py.ast.typed
@@ -0,0 +1,229 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 10, 2 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 2, 9, 2, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 3, 1, 3, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 3, 1, 3, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 3, 3, 3, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 3, 4, 3, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 3, 11, 3, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 5, 1, 5, 13 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 5, 1, 5, 1 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    } ],
+    "value" : {
+      "kind" : "ListExpr",
+      "location" : [ 5, 5, 5, 13 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "elements" : [ {
+        "kind" : "IntegerLiteral",
+        "location" : [ 5, 6, 5, 6 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 5, 9, 5, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 2
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 5, 12, 5, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ForStmt",
+    "location" : [ 7, 1, 10, 2 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 5, 7, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 7, 10, 7, 10 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "ForStmt",
+      "location" : [ 8, 5, 10, 1 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 9, 8, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      },
+      "iterable" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 14, 8, 14 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "z"
+      },
+      "body" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 9, 9, 9, 16 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 9, 9, 9, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 9, 9, 9, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "Identifier",
+            "location" : [ 9, 15, 9, 15 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "name" : "x"
+          } ]
+        }
+      } ]
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list_nested_same_var.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list_nested_same_var.py.ast.typed.s.result
new file mode 100644
index 0000000..a8401b1
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nested_same_var.py.ast.typed.s.result
@@ -0,0 +1,9 @@
+1
+2
+3
+1
+2
+3
+1
+2
+3
diff --git a/pa3-tests/core/stmt_for_list_none.py b/pa3-tests/core/stmt_for_list_none.py
new file mode 100644
index 0000000..fd511fa
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_none.py
@@ -0,0 +1,5 @@
+x:int = 0
+z:[int] = None
+
+for x in z:
+    print(x)
diff --git a/pa3-tests/core/stmt_for_list_none.py.ast.typed b/pa3-tests/core/stmt_for_list_none.py.ast.typed
new file mode 100644
index 0000000..00acc08
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_none.py.ast.typed
@@ -0,0 +1,127 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 6, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 14 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 7 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 2, 3, 2, 7 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 4, 2, 6 ],
+          "className" : "int"
+        }
+      }
+    },
+    "value" : {
+      "kind" : "NoneLiteral",
+      "location" : [ 2, 11, 2, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      }
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ForStmt",
+    "location" : [ 4, 1, 6, 1 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 5, 4, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 10, 4, 10 ],
+      "inferredType" : {
+        "kind" : "ListValueType",
+        "elementType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        }
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 5, 5, 5, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 5, 5, 5, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 5, 5, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 5, 11, 5, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list_none.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list_none.py.ast.typed.s.result
new file mode 100644
index 0000000..ae52477
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_none.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Operation on None
+Exited with error code 4
diff --git a/pa3-tests/core/stmt_for_list_nonlocal.py b/pa3-tests/core/stmt_for_list_nonlocal.py
new file mode 100644
index 0000000..e9b54a2
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nonlocal.py
@@ -0,0 +1,15 @@
+x:int = 0
+def crunch(zz:[[int]]) -> object:
+    z:[int] = None
+    global x
+    def make_z() -> object:
+        nonlocal z
+        for z in zz:
+            pass # Set z to last element in zz
+
+    make_z()
+    for x in z:
+        pass # Set x to last element in z
+
+crunch([[1,2],[2,3],[4,5],[6,7]])
+print(x) 
diff --git a/pa3-tests/core/stmt_for_list_nonlocal.py.ast.typed b/pa3-tests/core/stmt_for_list_nonlocal.py.ast.typed
new file mode 100644
index 0000000..2c686f8
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nonlocal.py.ast.typed
@@ -0,0 +1,408 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 15, 10 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 2, 1, 14, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 2, 5, 2, 10 ],
+      "name" : "crunch"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 2, 12, 2, 21 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 12, 2, 13 ],
+        "name" : "zz"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 2, 15, 2, 21 ],
+        "elementType" : {
+          "kind" : "ListType",
+          "location" : [ 2, 16, 2, 20 ],
+          "elementType" : {
+            "kind" : "ClassType",
+            "location" : [ 2, 17, 2, 19 ],
+            "className" : "int"
+          }
+        }
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 2, 27, 2, 32 ],
+      "className" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 3, 5, 3, 18 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 3, 5, 3, 11 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 5, 3, 5 ],
+          "name" : "z"
+        },
+        "type" : {
+          "kind" : "ListType",
+          "location" : [ 3, 7, 3, 11 ],
+          "elementType" : {
+            "kind" : "ClassType",
+            "location" : [ 3, 8, 3, 10 ],
+            "className" : "int"
+          }
+        }
+      },
+      "value" : {
+        "kind" : "NoneLiteral",
+        "location" : [ 3, 15, 3, 18 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        }
+      }
+    }, {
+      "kind" : "GlobalDecl",
+      "location" : [ 4, 5, 4, 12 ],
+      "variable" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 12, 4, 12 ],
+        "name" : "x"
+      }
+    }, {
+      "kind" : "FuncDef",
+      "location" : [ 5, 5, 10, 4 ],
+      "name" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 9, 5, 14 ],
+        "name" : "make_z"
+      },
+      "params" : [ ],
+      "returnType" : {
+        "kind" : "ClassType",
+        "location" : [ 5, 21, 5, 26 ],
+        "className" : "object"
+      },
+      "declarations" : [ {
+        "kind" : "NonLocalDecl",
+        "location" : [ 6, 9, 6, 18 ],
+        "variable" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 18, 6, 18 ],
+          "name" : "z"
+        }
+      } ],
+      "statements" : [ {
+        "kind" : "ForStmt",
+        "location" : [ 7, 9, 10, 4 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 13, 7, 13 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "z"
+        },
+        "iterable" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 18, 7, 19 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ListValueType",
+              "elementType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            }
+          },
+          "name" : "zz"
+        },
+        "body" : [ ]
+      } ]
+    } ],
+    "statements" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 10, 5, 10, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 10, 5, 10, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "object"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 10, 5, 10, 10 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            }
+          },
+          "name" : "make_z"
+        },
+        "args" : [ ]
+      }
+    }, {
+      "kind" : "ForStmt",
+      "location" : [ 11, 5, 14, 0 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 9, 11, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      },
+      "iterable" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 14, 11, 14 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "z"
+      },
+      "body" : [ ]
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 14, 1, 14, 33 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 14, 1, 14, 33 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "object"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 14, 1, 14, 6 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ListValueType",
+              "elementType" : {
+                "kind" : "ClassValueType",
+                "className" : "int"
+              }
+            }
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          }
+        },
+        "name" : "crunch"
+      },
+      "args" : [ {
+        "kind" : "ListExpr",
+        "location" : [ 14, 8, 14, 32 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          }
+        },
+        "elements" : [ {
+          "kind" : "ListExpr",
+          "location" : [ 14, 9, 14, 13 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "elements" : [ {
+            "kind" : "IntegerLiteral",
+            "location" : [ 14, 10, 14, 10 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 1
+          }, {
+            "kind" : "IntegerLiteral",
+            "location" : [ 14, 12, 14, 12 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 2
+          } ]
+        }, {
+          "kind" : "ListExpr",
+          "location" : [ 14, 15, 14, 19 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "elements" : [ {
+            "kind" : "IntegerLiteral",
+            "location" : [ 14, 16, 14, 16 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 2
+          }, {
+            "kind" : "IntegerLiteral",
+            "location" : [ 14, 18, 14, 18 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 3
+          } ]
+        }, {
+          "kind" : "ListExpr",
+          "location" : [ 14, 21, 14, 25 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "elements" : [ {
+            "kind" : "IntegerLiteral",
+            "location" : [ 14, 22, 14, 22 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 4
+          }, {
+            "kind" : "IntegerLiteral",
+            "location" : [ 14, 24, 14, 24 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 5
+          } ]
+        }, {
+          "kind" : "ListExpr",
+          "location" : [ 14, 27, 14, 31 ],
+          "inferredType" : {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "elements" : [ {
+            "kind" : "IntegerLiteral",
+            "location" : [ 14, 28, 14, 28 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 6
+          }, {
+            "kind" : "IntegerLiteral",
+            "location" : [ 14, 30, 14, 30 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 7
+          } ]
+        } ]
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 15, 1, 15, 8 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 15, 1, 15, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 15, 1, 15, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 15, 7, 15, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list_nonlocal.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list_nonlocal.py.ast.typed.s.result
new file mode 100644
index 0000000..7f8f011
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_nonlocal.py.ast.typed.s.result
@@ -0,0 +1 @@
+7
diff --git a/pa3-tests/core/stmt_for_list_return.py b/pa3-tests/core/stmt_for_list_return.py
new file mode 100644
index 0000000..35716dd
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_return.py
@@ -0,0 +1,8 @@
+def print_list(z:[int]) -> object:
+    x:int = 0
+    for x in z:
+        print(x)
+        if x >= 30:
+            return
+
+print_list([10,20,30,40])
diff --git a/pa3-tests/core/stmt_for_list_return.py.ast.typed b/pa3-tests/core/stmt_for_list_return.py.ast.typed
new file mode 100644
index 0000000..4fca85f
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_return.py.ast.typed
@@ -0,0 +1,241 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 8, 26 ],
+  "declarations" : [ {
+    "kind" : "FuncDef",
+    "location" : [ 1, 1, 8, 0 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 5, 1, 14 ],
+      "name" : "print_list"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 1, 16, 1, 22 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 16, 1, 16 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ListType",
+        "location" : [ 1, 18, 1, 22 ],
+        "elementType" : {
+          "kind" : "ClassType",
+          "location" : [ 1, 19, 1, 21 ],
+          "className" : "int"
+        }
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 1, 28, 1, 33 ],
+      "className" : "object"
+    },
+    "declarations" : [ {
+      "kind" : "VarDef",
+      "location" : [ 2, 5, 2, 13 ],
+      "var" : {
+        "kind" : "TypedVar",
+        "location" : [ 2, 5, 2, 9 ],
+        "identifier" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 5 ],
+          "name" : "x"
+        },
+        "type" : {
+          "kind" : "ClassType",
+          "location" : [ 2, 7, 2, 9 ],
+          "className" : "int"
+        }
+      },
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 13, 2, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      }
+    } ],
+    "statements" : [ {
+      "kind" : "ForStmt",
+      "location" : [ 3, 5, 8, 0 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 9, 3, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      },
+      "iterable" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 14, 3, 14 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "name" : "z"
+      },
+      "body" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 4, 9, 4, 16 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 4, 9, 4, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 4, 9, 4, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "Identifier",
+            "location" : [ 4, 15, 4, 15 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "name" : "x"
+          } ]
+        }
+      }, {
+        "kind" : "IfStmt",
+        "location" : [ 5, 9, 8, 0 ],
+        "condition" : {
+          "kind" : "BinaryExpr",
+          "location" : [ 5, 12, 5, 18 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "left" : {
+            "kind" : "Identifier",
+            "location" : [ 5, 12, 5, 12 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "name" : "x"
+          },
+          "operator" : ">=",
+          "right" : {
+            "kind" : "IntegerLiteral",
+            "location" : [ 5, 17, 5, 18 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            },
+            "value" : 30
+          }
+        },
+        "thenBody" : [ {
+          "kind" : "ReturnStmt",
+          "location" : [ 6, 13, 6, 18 ],
+          "value" : null
+        } ],
+        "elseBody" : [ ]
+      } ]
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 8, 1, 8, 25 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 8, 1, 8, 25 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "object"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 1, 8, 10 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ListValueType",
+            "elementType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          }
+        },
+        "name" : "print_list"
+      },
+      "args" : [ {
+        "kind" : "ListExpr",
+        "location" : [ 8, 12, 8, 24 ],
+        "inferredType" : {
+          "kind" : "ListValueType",
+          "elementType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          }
+        },
+        "elements" : [ {
+          "kind" : "IntegerLiteral",
+          "location" : [ 8, 13, 8, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 10
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 8, 16, 8, 17 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 20
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 8, 19, 8, 20 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 30
+        }, {
+          "kind" : "IntegerLiteral",
+          "location" : [ 8, 22, 8, 23 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 40
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_list_return.py.ast.typed.s.result b/pa3-tests/core/stmt_for_list_return.py.ast.typed.s.result
new file mode 100644
index 0000000..300ed6f
--- /dev/null
+++ b/pa3-tests/core/stmt_for_list_return.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+10
+20
+30
diff --git a/pa3-tests/core/stmt_for_str.py b/pa3-tests/core/stmt_for_str.py
new file mode 100644
index 0000000..c3ab74f
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str.py
@@ -0,0 +1,5 @@
+x:str = ""
+z:str = "abc"
+
+for x in z:
+    print(x)
diff --git a/pa3-tests/core/stmt_for_str.py.ast.typed b/pa3-tests/core/stmt_for_str.py.ast.typed
new file mode 100644
index 0000000..4b0e583
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str.py.ast.typed
@@ -0,0 +1,121 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 6, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "abc"
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ForStmt",
+    "location" : [ 4, 1, 6, 1 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 5, 4, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 10, 4, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 5, 5, 5, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 5, 5, 5, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 5, 5, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 5, 11, 5, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "x"
+        } ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_str.py.ast.typed.s.result b/pa3-tests/core/stmt_for_str.py.ast.typed.s.result
new file mode 100644
index 0000000..de98044
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+a
+b
+c
diff --git a/pa3-tests/core/stmt_for_str_empty.py b/pa3-tests/core/stmt_for_str_empty.py
new file mode 100644
index 0000000..9dc60e7
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_empty.py
@@ -0,0 +1,8 @@
+x:str = ""
+y:str = "123"
+z:str = "abc"
+
+for x in z:
+    print(x)
+    for x in "":
+        print(x)
diff --git a/pa3-tests/core/stmt_for_str_empty.py.ast.typed b/pa3-tests/core/stmt_for_str_empty.py.ast.typed
new file mode 100644
index 0000000..9be591f
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_empty.py.ast.typed
@@ -0,0 +1,205 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 9, 2 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "123"
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 3, 1, 3, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 3, 1, 3, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 3, 3, 3, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 3, 9, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "abc"
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ForStmt",
+    "location" : [ 5, 1, 9, 2 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 5, 5, 5, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 5, 10, 5, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 6, 5, 6, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 6, 5, 6, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 5, 6, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 6, 11, 6, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "x"
+        } ]
+      }
+    }, {
+      "kind" : "ForStmt",
+      "location" : [ 7, 5, 9, 1 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 9, 7, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "x"
+      },
+      "iterable" : {
+        "kind" : "StringLiteral",
+        "location" : [ 7, 14, 7, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "value" : ""
+      },
+      "body" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 8, 9, 8, 16 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 8, 9, 8, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 8, 9, 8, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "Identifier",
+            "location" : [ 8, 15, 8, 15 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "name" : "x"
+          } ]
+        }
+      } ]
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_str_empty.py.ast.typed.s.result b/pa3-tests/core/stmt_for_str_empty.py.ast.typed.s.result
new file mode 100644
index 0000000..de98044
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_empty.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+a
+b
+c
diff --git a/pa3-tests/core/stmt_for_str_eval.py b/pa3-tests/core/stmt_for_str_eval.py
new file mode 100644
index 0000000..69c2ea9
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_eval.py
@@ -0,0 +1,6 @@
+x:str = ""
+z:str = "abc"
+
+for x in z:
+    z = "doesn't matter"
+    print(x)
diff --git a/pa3-tests/core/stmt_for_str_eval.py.ast.typed b/pa3-tests/core/stmt_for_str_eval.py.ast.typed
new file mode 100644
index 0000000..1e64270
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_eval.py.ast.typed
@@ -0,0 +1,142 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 7, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "abc"
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ForStmt",
+    "location" : [ 4, 1, 7, 1 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 5, 4, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 10, 4, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "AssignStmt",
+      "location" : [ 5, 5, 5, 24 ],
+      "targets" : [ {
+        "kind" : "Identifier",
+        "location" : [ 5, 5, 5, 5 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "z"
+      } ],
+      "value" : {
+        "kind" : "StringLiteral",
+        "location" : [ 5, 9, 5, 24 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "value" : "doesn't matter"
+      }
+    }, {
+      "kind" : "ExprStmt",
+      "location" : [ 6, 5, 6, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 6, 5, 6, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 5, 6, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 6, 11, 6, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "x"
+        } ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_str_eval.py.ast.typed.s.result b/pa3-tests/core/stmt_for_str_eval.py.ast.typed.s.result
new file mode 100644
index 0000000..de98044
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_eval.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+a
+b
+c
diff --git a/pa3-tests/core/stmt_for_str_nested.py b/pa3-tests/core/stmt_for_str_nested.py
new file mode 100644
index 0000000..81f0f46
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_nested.py
@@ -0,0 +1,8 @@
+x:str = ""
+y:str = "123"
+z:str = "abc"
+
+for x in z:
+    print(x)
+    for x in y:
+        print(x)
diff --git a/pa3-tests/core/stmt_for_str_nested.py.ast.typed b/pa3-tests/core/stmt_for_str_nested.py.ast.typed
new file mode 100644
index 0000000..5260c3b
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_nested.py.ast.typed
@@ -0,0 +1,205 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 9, 2 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "123"
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 3, 1, 3, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 3, 1, 3, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "name" : "z"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 3, 3, 3, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 3, 9, 3, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "abc"
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ForStmt",
+    "location" : [ 5, 1, 9, 2 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 5, 5, 5, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 5, 10, 5, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "z"
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 6, 5, 6, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 6, 5, 6, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 5, 6, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 6, 11, 6, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "x"
+        } ]
+      }
+    }, {
+      "kind" : "ForStmt",
+      "location" : [ 7, 5, 9, 1 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 9, 7, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "x"
+      },
+      "iterable" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 14, 7, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "y"
+      },
+      "body" : [ {
+        "kind" : "ExprStmt",
+        "location" : [ 8, 9, 8, 16 ],
+        "expr" : {
+          "kind" : "CallExpr",
+          "location" : [ 8, 9, 8, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          },
+          "function" : {
+            "kind" : "Identifier",
+            "location" : [ 8, 9, 8, 13 ],
+            "inferredType" : {
+              "kind" : "FuncType",
+              "parameters" : [ {
+                "kind" : "ClassValueType",
+                "className" : "object"
+              } ],
+              "returnType" : {
+                "kind" : "ClassValueType",
+                "className" : "<None>"
+              }
+            },
+            "name" : "print"
+          },
+          "args" : [ {
+            "kind" : "Identifier",
+            "location" : [ 8, 15, 8, 15 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "name" : "x"
+          } ]
+        }
+      } ]
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_str_nested.py.ast.typed.s.result b/pa3-tests/core/stmt_for_str_nested.py.ast.typed.s.result
new file mode 100644
index 0000000..c2cb64d
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_nested.py.ast.typed.s.result
@@ -0,0 +1,12 @@
+a
+1
+2
+3
+b
+1
+2
+3
+c
+1
+2
+3
diff --git a/pa3-tests/core/stmt_for_str_same_var.py b/pa3-tests/core/stmt_for_str_same_var.py
new file mode 100644
index 0000000..438c74e
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_same_var.py
@@ -0,0 +1,4 @@
+x:str = "xXx"
+
+for x in x:
+    print(x)
diff --git a/pa3-tests/core/stmt_for_str_same_var.py.ast.typed b/pa3-tests/core/stmt_for_str_same_var.py.ast.typed
new file mode 100644
index 0000000..e3870ec
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_same_var.py.ast.typed
@@ -0,0 +1,95 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 5, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "xXx"
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "ForStmt",
+    "location" : [ 3, 1, 5, 1 ],
+    "identifier" : {
+      "kind" : "Identifier",
+      "location" : [ 3, 5, 3, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "x"
+    },
+    "iterable" : {
+      "kind" : "Identifier",
+      "location" : [ 3, 10, 3, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "x"
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 4, 5, 4, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 4, 5, 4, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 5, 4, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 4, 11, 4, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "x"
+        } ]
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_for_str_same_var.py.ast.typed.s.result b/pa3-tests/core/stmt_for_str_same_var.py.ast.typed.s.result
new file mode 100644
index 0000000..723425f
--- /dev/null
+++ b/pa3-tests/core/stmt_for_str_same_var.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+x
+X
+x
diff --git a/pa3-tests/core/stmt_if.py b/pa3-tests/core/stmt_if.py
new file mode 100644
index 0000000..61bc605
--- /dev/null
+++ b/pa3-tests/core/stmt_if.py
@@ -0,0 +1,7 @@
+if False:
+    print("No")
+elif True:
+    if True:
+        print("Yes")
+else:
+    pass
diff --git a/pa3-tests/core/stmt_if.py.ast.typed b/pa3-tests/core/stmt_if.py.ast.typed
new file mode 100644
index 0000000..0b67124
--- /dev/null
+++ b/pa3-tests/core/stmt_if.py.ast.typed
@@ -0,0 +1,125 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 8, 1 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "IfStmt",
+    "location" : [ 1, 1, 8, 1 ],
+    "condition" : {
+      "kind" : "BooleanLiteral",
+      "location" : [ 1, 4, 1, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "bool"
+      },
+      "value" : false
+    },
+    "thenBody" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 2, 5, 2, 15 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 2, 5, 2, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 2, 5, 2, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 2, 11, 2, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "No"
+        } ]
+      }
+    } ],
+    "elseBody" : [ {
+      "kind" : "IfStmt",
+      "location" : [ 3, 1, 8, 1 ],
+      "condition" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 3, 6, 3, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      },
+      "thenBody" : [ {
+        "kind" : "IfStmt",
+        "location" : [ 4, 5, 6, 0 ],
+        "condition" : {
+          "kind" : "BooleanLiteral",
+          "location" : [ 4, 8, 4, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "bool"
+          },
+          "value" : true
+        },
+        "thenBody" : [ {
+          "kind" : "ExprStmt",
+          "location" : [ 5, 9, 5, 20 ],
+          "expr" : {
+            "kind" : "CallExpr",
+            "location" : [ 5, 9, 5, 20 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            },
+            "function" : {
+              "kind" : "Identifier",
+              "location" : [ 5, 9, 5, 13 ],
+              "inferredType" : {
+                "kind" : "FuncType",
+                "parameters" : [ {
+                  "kind" : "ClassValueType",
+                  "className" : "object"
+                } ],
+                "returnType" : {
+                  "kind" : "ClassValueType",
+                  "className" : "<None>"
+                }
+              },
+              "name" : "print"
+            },
+            "args" : [ {
+              "kind" : "StringLiteral",
+              "location" : [ 5, 15, 5, 19 ],
+              "inferredType" : {
+                "kind" : "ClassValueType",
+                "className" : "str"
+              },
+              "value" : "Yes"
+            } ]
+          }
+        } ],
+        "elseBody" : [ ]
+      } ],
+      "elseBody" : [ ]
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_if.py.ast.typed.s.result b/pa3-tests/core/stmt_if.py.ast.typed.s.result
new file mode 100644
index 0000000..dcd7a5d
--- /dev/null
+++ b/pa3-tests/core/stmt_if.py.ast.typed.s.result
@@ -0,0 +1 @@
+Yes
diff --git a/pa3-tests/core/stmt_return_early.py b/pa3-tests/core/stmt_return_early.py
new file mode 100644
index 0000000..267eab7
--- /dev/null
+++ b/pa3-tests/core/stmt_return_early.py
@@ -0,0 +1,6 @@
+def f() -> int:
+    while True:
+        return 1
+    return 0
+
+print(f())
diff --git a/pa3-tests/core/stmt_return_early.py.ast.typed b/pa3-tests/core/stmt_return_early.py.ast.typed
new file mode 100644
index 0000000..4568349
--- /dev/null
+++ b/pa3-tests/core/stmt_return_early.py.ast.typed
@@ -0,0 +1,113 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 6, 11 ],
+  "declarations" : [ {
+    "kind" : "FuncDef",
+    "location" : [ 1, 1, 4, 13 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 1, 5, 1, 5 ],
+      "name" : "f"
+    },
+    "params" : [ ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 1, 12, 1, 14 ],
+      "className" : "int"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "WhileStmt",
+      "location" : [ 2, 5, 4, 4 ],
+      "condition" : {
+        "kind" : "BooleanLiteral",
+        "location" : [ 2, 11, 2, 14 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "value" : true
+      },
+      "body" : [ {
+        "kind" : "ReturnStmt",
+        "location" : [ 3, 9, 3, 16 ],
+        "value" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 3, 16, 3, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }
+      } ]
+    }, {
+      "kind" : "ReturnStmt",
+      "location" : [ 4, 5, 4, 12 ],
+      "value" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 4, 12, 4, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 6, 1, 6, 10 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 6, 1, 6, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 6, 1, 6, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 6, 7, 6, 9 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 7, 6, 7 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "f"
+        },
+        "args" : [ ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_return_early.py.ast.typed.s.result b/pa3-tests/core/stmt_return_early.py.ast.typed.s.result
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/pa3-tests/core/stmt_return_early.py.ast.typed.s.result
@@ -0,0 +1 @@
+1
diff --git a/pa3-tests/core/stmt_while.py b/pa3-tests/core/stmt_while.py
new file mode 100644
index 0000000..acb4d7a
--- /dev/null
+++ b/pa3-tests/core/stmt_while.py
@@ -0,0 +1,4 @@
+x:int = 1
+while x < 10:
+    print(x)
+    x = x + 1
diff --git a/pa3-tests/core/stmt_while.py.ast.typed b/pa3-tests/core/stmt_while.py.ast.typed
new file mode 100644
index 0000000..3802a75
--- /dev/null
+++ b/pa3-tests/core/stmt_while.py.ast.typed
@@ -0,0 +1,143 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 5, 1 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 1
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "WhileStmt",
+    "location" : [ 2, 1, 5, 1 ],
+    "condition" : {
+      "kind" : "BinaryExpr",
+      "location" : [ 2, 7, 2, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "bool"
+      },
+      "left" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 7, 2, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      },
+      "operator" : "<",
+      "right" : {
+        "kind" : "IntegerLiteral",
+        "location" : [ 2, 11, 2, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 10
+      }
+    },
+    "body" : [ {
+      "kind" : "ExprStmt",
+      "location" : [ 3, 5, 3, 12 ],
+      "expr" : {
+        "kind" : "CallExpr",
+        "location" : [ 3, 5, 3, 12 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "<None>"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 3, 5, 3, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "<None>"
+            }
+          },
+          "name" : "print"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 3, 11, 3, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        } ]
+      }
+    }, {
+      "kind" : "AssignStmt",
+      "location" : [ 4, 5, 4, 13 ],
+      "targets" : [ {
+        "kind" : "Identifier",
+        "location" : [ 4, 5, 4, 5 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      } ],
+      "value" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 4, 9, 4, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "left" : {
+          "kind" : "Identifier",
+          "location" : [ 4, 9, 4, 9 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "x"
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 4, 13, 4, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }
+      }
+    } ]
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/stmt_while.py.ast.typed.s.result b/pa3-tests/core/stmt_while.py.ast.typed.s.result
new file mode 100644
index 0000000..0719398
--- /dev/null
+++ b/pa3-tests/core/stmt_while.py.ast.typed.s.result
@@ -0,0 +1,9 @@
+1
+2
+3
+4
+5
+6
+7
+8
+9
diff --git a/pa3-tests/core/str_cat.py b/pa3-tests/core/str_cat.py
new file mode 100644
index 0000000..f28db5e
--- /dev/null
+++ b/pa3-tests/core/str_cat.py
@@ -0,0 +1,17 @@
+a:str = "Hello"
+b:str = "World"
+c:str = "ChocoPy"
+
+def cat2(a:str, b:str) -> str:
+    return a + b
+
+def cat3(a:str, b:str, c:str) -> str:
+    return a + b + c
+
+print(cat2(a, b))
+print(cat2("", c))
+print(cat3(a, " ", c))
+print(len(a))
+print(len(cat2(a,a)))
+print(len(cat2("","")))
+
diff --git a/pa3-tests/core/str_cat.py.ast.typed b/pa3-tests/core/str_cat.py.ast.typed
new file mode 100644
index 0000000..1db5a86
--- /dev/null
+++ b/pa3-tests/core/str_cat.py.ast.typed
@@ -0,0 +1,738 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 16, 24 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 15 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 15 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "Hello"
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 15 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "b"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 15 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "World"
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 3, 1, 3, 17 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 3, 1, 3, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "name" : "c"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 3, 3, 3, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 3, 9, 3, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "ChocoPy"
+    }
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 5, 1, 6, 17 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 5, 5, 5, 8 ],
+      "name" : "cat2"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 5, 10, 5, 14 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 10, 5, 10 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 5, 12, 5, 14 ],
+        "className" : "str"
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 5, 17, 5, 21 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 5, 17, 5, 17 ],
+        "name" : "b"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 5, 19, 5, 21 ],
+        "className" : "str"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 5, 27, 5, 29 ],
+      "className" : "str"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 6, 5, 6, 16 ],
+      "value" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 6, 12, 6, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "left" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 12, 6, 12 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "a"
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "Identifier",
+          "location" : [ 6, 16, 6, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "b"
+        }
+      }
+    } ]
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 8, 1, 9, 21 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 8, 5, 8, 8 ],
+      "name" : "cat3"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 8, 10, 8, 14 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 10, 8, 10 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 8, 12, 8, 14 ],
+        "className" : "str"
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 8, 17, 8, 21 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 17, 8, 17 ],
+        "name" : "b"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 8, 19, 8, 21 ],
+        "className" : "str"
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 8, 24, 8, 28 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 24, 8, 24 ],
+        "name" : "c"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 8, 26, 8, 28 ],
+        "className" : "str"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 8, 34, 8, 36 ],
+      "className" : "str"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 9, 5, 9, 20 ],
+      "value" : {
+        "kind" : "BinaryExpr",
+        "location" : [ 9, 12, 9, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "left" : {
+          "kind" : "BinaryExpr",
+          "location" : [ 9, 12, 9, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "left" : {
+            "kind" : "Identifier",
+            "location" : [ 9, 12, 9, 12 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "name" : "a"
+          },
+          "operator" : "+",
+          "right" : {
+            "kind" : "Identifier",
+            "location" : [ 9, 16, 9, 16 ],
+            "inferredType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            },
+            "name" : "b"
+          }
+        },
+        "operator" : "+",
+        "right" : {
+          "kind" : "Identifier",
+          "location" : [ 9, 20, 9, 20 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "c"
+        }
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 11, 1, 11, 17 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 11, 1, 11, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 1, 11, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 11, 7, 11, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 11, 7, 11, 10 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            }, {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            }
+          },
+          "name" : "cat2"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 11, 12, 11, 12 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "a"
+        }, {
+          "kind" : "Identifier",
+          "location" : [ 11, 15, 11, 15 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "b"
+        } ]
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 12, 1, 12, 18 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 12, 1, 12, 18 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 12, 1, 12, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 12, 7, 12, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 12, 7, 12, 10 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            }, {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            }
+          },
+          "name" : "cat2"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 12, 12, 12, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : ""
+        }, {
+          "kind" : "Identifier",
+          "location" : [ 12, 16, 12, 16 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "c"
+        } ]
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 13, 1, 13, 22 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 13, 1, 13, 22 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 13, 1, 13, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
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diff --git a/pa3-tests/core/str_cat.py.ast.typed.s.result b/pa3-tests/core/str_cat.py.ast.typed.s.result
new file mode 100644
index 0000000..b2e262a
--- /dev/null
+++ b/pa3-tests/core/str_cat.py.ast.typed.s.result
@@ -0,0 +1,6 @@
+HelloWorld
+ChocoPy
+Hello ChocoPy
+5
+10
+0
diff --git a/pa3-tests/core/str_cat_2.py b/pa3-tests/core/str_cat_2.py
new file mode 100644
index 0000000..f8367c0
--- /dev/null
+++ b/pa3-tests/core/str_cat_2.py
@@ -0,0 +1,19 @@
+a:str = "no"
+b:str = "o"
+c:str = ""
+d:str = ""
+e:str = ""
+
+def cat2(a:str, b:str) -> str:
+    return a + b
+
+def cat3(a:str, b:str, c:str) -> str:
+    return a + b + c
+
+c = cat2(b, a)
+d = cat2(a, a)
+e = cat3(a, b, cat2(b, b))
+
+print(c)
+print(d)
+print(e)
diff --git a/pa3-tests/core/str_cat_2.py.ast.typed b/pa3-tests/core/str_cat_2.py.ast.typed
new file mode 100644
index 0000000..543fa96
--- /dev/null
+++ b/pa3-tests/core/str_cat_2.py.ast.typed
@@ -0,0 +1,638 @@
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+    }
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+          "className" : "str"
+        },
+        "name" : "e"
+      } ]
+    }
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diff --git a/pa3-tests/core/str_cat_2.py.ast.typed.s.result b/pa3-tests/core/str_cat_2.py.ast.typed.s.result
new file mode 100644
index 0000000..2f6ff88
--- /dev/null
+++ b/pa3-tests/core/str_cat_2.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+ono
+nono
+noooo
diff --git a/pa3-tests/core/str_cmp.py b/pa3-tests/core/str_cmp.py
new file mode 100644
index 0000000..9258cd9
--- /dev/null
+++ b/pa3-tests/core/str_cmp.py
@@ -0,0 +1,17 @@
+a:str = "Hello"
+b:str = "World"
+c:str = "ChocoPy"
+
+def eq(a:str, b:str) -> bool:
+    return a == b
+
+def neq(a:str, b:str) -> bool:
+    return a != b
+
+print(eq(a,a))
+print(eq(a,b))
+print(neq(a,b))
+print(neq(b,b))
+print(eq(c,a))
+print(neq(c,b))
+
diff --git a/pa3-tests/core/str_cmp.py.ast.typed b/pa3-tests/core/str_cmp.py.ast.typed
new file mode 100644
index 0000000..b185ac1
--- /dev/null
+++ b/pa3-tests/core/str_cmp.py.ast.typed
@@ -0,0 +1,659 @@
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+      "identifier" : {
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+        "name" : "a"
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+        "className" : "str"
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+        "className" : "str"
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+      },
+      "value" : "World"
+    }
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+      },
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+        "className" : "str"
+      }
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+          },
+          "name" : "b"
+        } ]
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 15, 1, 15, 14 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 15, 1, 15, 14 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 15, 1, 15, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 15, 7, 15, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "bool"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 15, 7, 15, 8 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            }, {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "bool"
+            }
+          },
+          "name" : "eq"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 15, 10, 15, 10 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "c"
+        }, {
+          "kind" : "Identifier",
+          "location" : [ 15, 12, 15, 12 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "a"
+        } ]
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 16, 1, 16, 15 ],
+    "expr" : {
+      "kind" : "CallExpr",
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+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 16, 1, 16, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 16, 7, 16, 14 ],
+        "inferredType" : {
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+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            }, {
+              "kind" : "ClassValueType",
+              "className" : "str"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "bool"
+            }
+          },
+          "name" : "neq"
+        },
+        "args" : [ {
+          "kind" : "Identifier",
+          "location" : [ 16, 11, 16, 11 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "c"
+        }, {
+          "kind" : "Identifier",
+          "location" : [ 16, 13, 16, 13 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "b"
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/str_cmp.py.ast.typed.s.result b/pa3-tests/core/str_cmp.py.ast.typed.s.result
new file mode 100644
index 0000000..72232fd
--- /dev/null
+++ b/pa3-tests/core/str_cmp.py.ast.typed.s.result
@@ -0,0 +1,6 @@
+True
+False
+True
+False
+False
+True
diff --git a/pa3-tests/core/str_get_element.py b/pa3-tests/core/str_get_element.py
new file mode 100644
index 0000000..8681a05
--- /dev/null
+++ b/pa3-tests/core/str_get_element.py
@@ -0,0 +1,14 @@
+x:str = "abc"
+a:str = ""
+b:str = ""
+c:str = ""
+
+def str_get(s:str, i:int) -> str:
+    return s[i]
+
+a = str_get(x, 0)
+b = str_get(x, 1)
+c = str_get(x, 2)
+print(a)
+print(b)
+print(c)
diff --git a/pa3-tests/core/str_get_element.py.ast.typed b/pa3-tests/core/str_get_element.py.ast.typed
new file mode 100644
index 0000000..ff9c449
--- /dev/null
+++ b/pa3-tests/core/str_get_element.py.ast.typed
@@ -0,0 +1,462 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 14, 9 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "abc"
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
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+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 3, 1, 3, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 3, 1, 3, 1 ],
+        "name" : "b"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 3, 3, 3, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
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+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
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+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 4, 1, 4, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 1 ],
+        "name" : "c"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 3, 4, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 4, 9, 4, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
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+    "location" : [ 6, 1, 7, 16 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 6, 5, 6, 11 ],
+      "name" : "str_get"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 6, 13, 6, 17 ],
+      "identifier" : {
+        "kind" : "Identifier",
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+        "name" : "s"
+      },
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+        "className" : "str"
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 6, 20, 6, 24 ],
+      "identifier" : {
+        "kind" : "Identifier",
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+        "name" : "i"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 6, 22, 6, 24 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 6, 30, 6, 32 ],
+      "className" : "str"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 7, 5, 7, 15 ],
+      "value" : {
+        "kind" : "IndexExpr",
+        "location" : [ 7, 12, 7, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 12, 7, 12 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "s"
+        },
+        "index" : {
+          "kind" : "Identifier",
+          "location" : [ 7, 14, 7, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "i"
+        }
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 9, 1, 9, 17 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 9, 1, 9, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "a"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 9, 5, 9, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 9, 5, 9, 11 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }, {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }
+        },
+        "name" : "str_get"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 9, 13, 9, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "x"
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 9, 16, 9, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      } ]
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 10, 1, 10, 17 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 10, 1, 10, 1 ],
+      "inferredType" : {
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+        "className" : "str"
+      },
+      "name" : "b"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 10, 5, 10, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
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+        "location" : [ 10, 5, 10, 11 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }, {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }
+        },
+        "name" : "str_get"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 10, 13, 10, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "x"
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 10, 16, 10, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 1
+      } ]
+    }
+  }, {
+    "kind" : "AssignStmt",
+    "location" : [ 11, 1, 11, 17 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 11, 1, 11, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "c"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 11, 5, 11, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 11, 5, 11, 11 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }, {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }
+        },
+        "name" : "str_get"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 11, 13, 11, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "x"
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 11, 16, 11, 16 ],
+        "inferredType" : {
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+        },
+        "value" : 2
+      } ]
+    }
+  }, {
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+    "expr" : {
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+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 12, 1, 12, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 12, 7, 12, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "a"
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 13, 1, 13, 8 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 13, 1, 13, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
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+        "inferredType" : {
+          "kind" : "FuncType",
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+            "kind" : "ClassValueType",
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+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 13, 7, 13, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "b"
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 14, 1, 14, 8 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 14, 1, 14, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 14, 1, 14, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 14, 7, 14, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "c"
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/str_get_element.py.ast.typed.s.result b/pa3-tests/core/str_get_element.py.ast.typed.s.result
new file mode 100644
index 0000000..de98044
--- /dev/null
+++ b/pa3-tests/core/str_get_element.py.ast.typed.s.result
@@ -0,0 +1,3 @@
+a
+b
+c
diff --git a/pa3-tests/core/str_get_element_oob_1.py b/pa3-tests/core/str_get_element_oob_1.py
new file mode 100644
index 0000000..b6613d1
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_1.py
@@ -0,0 +1,8 @@
+x:str = "abc"
+a:str = ""
+
+def str_get(s:str, i:int) -> str:
+    return s[i]
+
+a = str_get(x, -1)
+print(a)
diff --git a/pa3-tests/core/str_get_element_oob_1.py.ast.typed b/pa3-tests/core/str_get_element_oob_1.py.ast.typed
new file mode 100644
index 0000000..4ce2733
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_1.py.ast.typed
@@ -0,0 +1,235 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 8, 9 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "abc"
+    }
+  }, {
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+    "location" : [ 2, 1, 2, 10 ],
+    "var" : {
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+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 4, 1, 5, 16 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 5, 4, 11 ],
+      "name" : "str_get"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 4, 13, 4, 17 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 13, 4, 13 ],
+        "name" : "s"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 15, 4, 17 ],
+        "className" : "str"
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 4, 20, 4, 24 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 20, 4, 20 ],
+        "name" : "i"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 22, 4, 24 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 4, 30, 4, 32 ],
+      "className" : "str"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 5, 5, 5, 15 ],
+      "value" : {
+        "kind" : "IndexExpr",
+        "location" : [ 5, 12, 5, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 12, 5, 12 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "s"
+        },
+        "index" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 14, 5, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "i"
+        }
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 7, 1, 7, 18 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 7, 1, 7, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "a"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 7, 5, 7, 18 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 5, 7, 11 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }, {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }
+        },
+        "name" : "str_get"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 7, 13, 7, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "x"
+      }, {
+        "kind" : "UnaryExpr",
+        "location" : [ 7, 16, 7, 17 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "operator" : "-",
+        "operand" : {
+          "kind" : "IntegerLiteral",
+          "location" : [ 7, 17, 7, 17 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "value" : 1
+        }
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 8, 1, 8, 8 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 8, 1, 8, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 1, 8, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 8, 7, 8, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "a"
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/str_get_element_oob_1.py.ast.typed.s.result b/pa3-tests/core/str_get_element_oob_1.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_1.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/str_get_element_oob_2.py b/pa3-tests/core/str_get_element_oob_2.py
new file mode 100644
index 0000000..4c4e0e0
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_2.py
@@ -0,0 +1,8 @@
+x:str = "abc"
+a:str = ""
+
+def str_get(s:str, i:int) -> str:
+    return s[i]
+
+a = str_get(x, 3)
+print(a)
diff --git a/pa3-tests/core/str_get_element_oob_2.py.ast.typed b/pa3-tests/core/str_get_element_oob_2.py.ast.typed
new file mode 100644
index 0000000..3a10e59
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_2.py.ast.typed
@@ -0,0 +1,226 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 8, 9 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 13 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 13 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : "abc"
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 4, 1, 5, 16 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 5, 4, 11 ],
+      "name" : "str_get"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 4, 13, 4, 17 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 13, 4, 13 ],
+        "name" : "s"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 15, 4, 17 ],
+        "className" : "str"
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 4, 20, 4, 24 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 20, 4, 20 ],
+        "name" : "i"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 22, 4, 24 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 4, 30, 4, 32 ],
+      "className" : "str"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 5, 5, 5, 15 ],
+      "value" : {
+        "kind" : "IndexExpr",
+        "location" : [ 5, 12, 5, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 12, 5, 12 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "s"
+        },
+        "index" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 14, 5, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "i"
+        }
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 7, 1, 7, 17 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 7, 1, 7, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "a"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 7, 5, 7, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 5, 7, 11 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }, {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }
+        },
+        "name" : "str_get"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 7, 13, 7, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "x"
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 7, 16, 7, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 3
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 8, 1, 8, 8 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 8, 1, 8, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 1, 8, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 8, 7, 8, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "a"
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/str_get_element_oob_2.py.ast.typed.s.result b/pa3-tests/core/str_get_element_oob_2.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_2.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/str_get_element_oob_3.py b/pa3-tests/core/str_get_element_oob_3.py
new file mode 100644
index 0000000..28e545a
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_3.py
@@ -0,0 +1,8 @@
+x:str = ""
+a:str = ""
+
+def str_get(s:str, i:int) -> str:
+    return s[i]
+
+a = str_get(x, 0)
+print(a)
diff --git a/pa3-tests/core/str_get_element_oob_3.py.ast.typed b/pa3-tests/core/str_get_element_oob_3.py.ast.typed
new file mode 100644
index 0000000..bac1f18
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_3.py.ast.typed
@@ -0,0 +1,226 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 8, 9 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 1, 9, 1, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 10 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "a"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 5 ],
+        "className" : "str"
+      }
+    },
+    "value" : {
+      "kind" : "StringLiteral",
+      "location" : [ 2, 9, 2, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "value" : ""
+    }
+  }, {
+    "kind" : "FuncDef",
+    "location" : [ 4, 1, 5, 16 ],
+    "name" : {
+      "kind" : "Identifier",
+      "location" : [ 4, 5, 4, 11 ],
+      "name" : "str_get"
+    },
+    "params" : [ {
+      "kind" : "TypedVar",
+      "location" : [ 4, 13, 4, 17 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 13, 4, 13 ],
+        "name" : "s"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 15, 4, 17 ],
+        "className" : "str"
+      }
+    }, {
+      "kind" : "TypedVar",
+      "location" : [ 4, 20, 4, 24 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 20, 4, 20 ],
+        "name" : "i"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 4, 22, 4, 24 ],
+        "className" : "int"
+      }
+    } ],
+    "returnType" : {
+      "kind" : "ClassType",
+      "location" : [ 4, 30, 4, 32 ],
+      "className" : "str"
+    },
+    "declarations" : [ ],
+    "statements" : [ {
+      "kind" : "ReturnStmt",
+      "location" : [ 5, 5, 5, 15 ],
+      "value" : {
+        "kind" : "IndexExpr",
+        "location" : [ 5, 12, 5, 15 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "list" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 12, 5, 12 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "name" : "s"
+        },
+        "index" : {
+          "kind" : "Identifier",
+          "location" : [ 5, 14, 5, 14 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          },
+          "name" : "i"
+        }
+      }
+    } ]
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 7, 1, 7, 17 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 7, 1, 7, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "name" : "a"
+    } ],
+    "value" : {
+      "kind" : "CallExpr",
+      "location" : [ 7, 5, 7, 17 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "str"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 7, 5, 7, 11 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }, {
+            "kind" : "ClassValueType",
+            "className" : "int"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          }
+        },
+        "name" : "str_get"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 7, 13, 7, 13 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "x"
+      }, {
+        "kind" : "IntegerLiteral",
+        "location" : [ 7, 16, 7, 16 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "value" : 0
+      } ]
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 8, 1, 8, 8 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 8, 1, 8, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 8, 1, 8, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 8, 7, 8, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "str"
+        },
+        "name" : "a"
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/str_get_element_oob_3.py.ast.typed.s.result b/pa3-tests/core/str_get_element_oob_3.py.ast.typed.s.result
new file mode 100644
index 0000000..144d019
--- /dev/null
+++ b/pa3-tests/core/str_get_element_oob_3.py.ast.typed.s.result
@@ -0,0 +1,2 @@
+Index out of bounds
+Exited with error code 3
diff --git a/pa3-tests/core/str_len.py b/pa3-tests/core/str_len.py
new file mode 100644
index 0000000..829f00b
--- /dev/null
+++ b/pa3-tests/core/str_len.py
@@ -0,0 +1 @@
+print(len("ChocoPy"))
diff --git a/pa3-tests/core/str_len.py.ast.typed b/pa3-tests/core/str_len.py.ast.typed
new file mode 100644
index 0000000..d76359c
--- /dev/null
+++ b/pa3-tests/core/str_len.py.ast.typed
@@ -0,0 +1,71 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 1, 22 ],
+  "declarations" : [ ],
+  "statements" : [ {
+    "kind" : "ExprStmt",
+    "location" : [ 1, 1, 1, 21 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 1, 1, 1, 21 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "CallExpr",
+        "location" : [ 1, 7, 1, 20 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "function" : {
+          "kind" : "Identifier",
+          "location" : [ 1, 7, 1, 9 ],
+          "inferredType" : {
+            "kind" : "FuncType",
+            "parameters" : [ {
+              "kind" : "ClassValueType",
+              "className" : "object"
+            } ],
+            "returnType" : {
+              "kind" : "ClassValueType",
+              "className" : "int"
+            }
+          },
+          "name" : "len"
+        },
+        "args" : [ {
+          "kind" : "StringLiteral",
+          "location" : [ 1, 11, 1, 19 ],
+          "inferredType" : {
+            "kind" : "ClassValueType",
+            "className" : "str"
+          },
+          "value" : "ChocoPy"
+        } ]
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/str_len.py.ast.typed.s.result b/pa3-tests/core/str_len.py.ast.typed.s.result
new file mode 100644
index 0000000..7f8f011
--- /dev/null
+++ b/pa3-tests/core/str_len.py.ast.typed.s.result
@@ -0,0 +1 @@
+7
diff --git a/pa3-tests/core/var_assign.py b/pa3-tests/core/var_assign.py
new file mode 100644
index 0000000..c56b7ca
--- /dev/null
+++ b/pa3-tests/core/var_assign.py
@@ -0,0 +1,4 @@
+x:int = 0
+y:object = 1
+x = y = 42
+print(x)
diff --git a/pa3-tests/core/var_assign.py.ast.typed b/pa3-tests/core/var_assign.py.ast.typed
new file mode 100644
index 0000000..83fb4c4
--- /dev/null
+++ b/pa3-tests/core/var_assign.py.ast.typed
@@ -0,0 +1,128 @@
+{
+  "kind" : "Program",
+  "location" : [ 1, 1, 4, 9 ],
+  "declarations" : [ {
+    "kind" : "VarDef",
+    "location" : [ 1, 1, 1, 9 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 1, 1, 1, 5 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 1, 1, 1, 1 ],
+        "name" : "x"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 1, 3, 1, 5 ],
+        "className" : "int"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 1, 9, 1, 9 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 0
+    }
+  }, {
+    "kind" : "VarDef",
+    "location" : [ 2, 1, 2, 12 ],
+    "var" : {
+      "kind" : "TypedVar",
+      "location" : [ 2, 1, 2, 8 ],
+      "identifier" : {
+        "kind" : "Identifier",
+        "location" : [ 2, 1, 2, 1 ],
+        "name" : "y"
+      },
+      "type" : {
+        "kind" : "ClassType",
+        "location" : [ 2, 3, 2, 8 ],
+        "className" : "object"
+      }
+    },
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 2, 12, 2, 12 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 1
+    }
+  } ],
+  "statements" : [ {
+    "kind" : "AssignStmt",
+    "location" : [ 3, 1, 3, 10 ],
+    "targets" : [ {
+      "kind" : "Identifier",
+      "location" : [ 3, 1, 3, 1 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "name" : "x"
+    }, {
+      "kind" : "Identifier",
+      "location" : [ 3, 5, 3, 5 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "object"
+      },
+      "name" : "y"
+    } ],
+    "value" : {
+      "kind" : "IntegerLiteral",
+      "location" : [ 3, 9, 3, 10 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "int"
+      },
+      "value" : 42
+    }
+  }, {
+    "kind" : "ExprStmt",
+    "location" : [ 4, 1, 4, 8 ],
+    "expr" : {
+      "kind" : "CallExpr",
+      "location" : [ 4, 1, 4, 8 ],
+      "inferredType" : {
+        "kind" : "ClassValueType",
+        "className" : "<None>"
+      },
+      "function" : {
+        "kind" : "Identifier",
+        "location" : [ 4, 1, 4, 5 ],
+        "inferredType" : {
+          "kind" : "FuncType",
+          "parameters" : [ {
+            "kind" : "ClassValueType",
+            "className" : "object"
+          } ],
+          "returnType" : {
+            "kind" : "ClassValueType",
+            "className" : "<None>"
+          }
+        },
+        "name" : "print"
+      },
+      "args" : [ {
+        "kind" : "Identifier",
+        "location" : [ 4, 7, 4, 7 ],
+        "inferredType" : {
+          "kind" : "ClassValueType",
+          "className" : "int"
+        },
+        "name" : "x"
+      } ]
+    }
+  } ],
+  "errors" : {
+    "errors" : [ ],
+    "kind" : "Errors",
+    "location" : [ 0, 0, 0, 0 ]
+  }
+}
\ No newline at end of file
diff --git a/pa3-tests/core/var_assign.py.ast.typed.s.result b/pa3-tests/core/var_assign.py.ast.typed.s.result
new file mode 100644
index 0000000..d81cc07
--- /dev/null
+++ b/pa3-tests/core/var_assign.py.ast.typed.s.result
@@ -0,0 +1 @@
+42
diff --git a/pa3-tests/run-tests.sh b/pa3-tests/run-tests.sh
new file mode 100755
index 0000000..24a51be
--- /dev/null
+++ b/pa3-tests/run-tests.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+JAVA="java -cp pa3-tests/chocopy-ref.jar:target/assignment.jar chocopy.ChocoPy"
+
+echo "# CORE TESTS"
+${JAVA} --pass=..s --test --run --dir pa3-tests/core
+
+echo
+echo "# BENCHMARK CORRECTNESS TESTS"
+${JAVA} --pass=..s --test --run --dir pa3-tests/benchmarks
+
+echo
+echo "# BENCHMARK PERFORMANCE TESTS"
+${JAVA} --pass=..s --run --profile --dir pa3-tests/benchmarks | grep -e Reading -e Cycles