AST Dump for function
 LIST {
  UNARY OP POSTINC
   stab_var name=a def @<stdin>:5
  GOTO future (DEF)
  ASSIGNMENT
   stab_var name=e def @<stdin>:1
   BINARY OP -
    stab_var name=e def @<stdin>:1
    CONSTANT: (type=int)1
  LABEL(future):
   LABEL(past):
    IF:
     stab_var name=a def @<stdin>:5
    THEN:
     ASSIGNMENT
      stab_var name=e def @<stdin>:1
      BINARY OP /
       stab_var name=e def @<stdin>:1
       CONSTANT: (type=int)3
 }