Bug fixed:

unreachable code;
	symbol(value) not implemented.

src/main/jflex/chocopy/pa1/ChocoPy.jflex

@@ -39,7 +39,7 @@ import java.util.ArrayList;
     /** Return a terminal symbol of syntactic category TYPE and no
      *  semantic value at the current source location. */
     private Symbol symbol(int type) {
-        return symbol(type);
+        return symbol(type, null);
     }
 
     /** Return a terminal symbol of syntactic category TYPE and semantic
@@ -142,8 +142,9 @@ if True:
       if(top()< currIndent)
       {   
           /*
-          If current indentation is more than indents current level should have, 
+          If current indentation is more than the number of indents 
-          start a new level which will have `currIndent' spaces.
+          current level should have, start a new level which will have 
+          `currIndent' indents.
           */
           push(currIndent);
           return symbol(ChocoPyTokens.INDENT, currIndent);
@@ -153,7 +154,7 @@ if True:
 <AFTER> {
 
   /* Delimiters. */
-  {LineBreak}                 { return symbol(ChocoPyTokens.NEWLINE); yybegin(YYINITIAL); currIndent = 0;}
+  {LineBreak}                 {  yybegin(YYINITIAL); currIndent = 0;return symbol(ChocoPyTokens.NEWLINE);}
   ":"                         { return symbol(ChocoPyTokens.COLON); }
   ","                         { return symbol(ChocoPyTokens.COMMA); }