Lexer will pass the original tokens even if it can be inferred to match the type of terminal defined in .cup file.

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, null);
+        return symbol(type, yytext());
     }
 
     /** Return a terminal symbol of syntactic category TYPE and semantic