- | SYMBOL LARROW CSYMBOL SEMI exp (EGet (SYMBOL, CSYMBOL, exp), (SYMBOLleft, expright))
+ | SYMBOL LARROW CSYMBOL SEMI exp (EGet (SYMBOL, NONE, CSYMBOL, exp), (SYMBOLleft, expright))
+ | SYMBOL COLON typ LARROW CSYMBOL SEMI exp (EGet (SYMBOL, SOME typ, CSYMBOL, exp), (SYMBOLleft, expright))