def get_expected_tokens(self, parser, interval_set):
        # type: (QuilParser, IntervalSet) -> Iterator
        """
        Like the default getExpectedTokens method except that it will fallback to the rule name if the token isn't a
        literal. For instance, instead of <INVALID> for  integer it will return the rule name: INT
        """
        for tok in interval_set:
            literal_name = parser.literalNames[tok]
            symbolic_name = parser.symbolicNames[tok]

            if literal_name != '<INVALID>':
                yield literal_name
            else:
                yield symbolic_name
Like the default getExpectedTokens method except that it will fallback to the rule name if the token isn't a
        literal. For instance, instead of <INVALID> for  integer it will return the rule name: INT