51     def __iter__(self):

    51     def __iter__(self):

    52         return iter(self.lines)

    52         return iter(self.lines)

    53 

    53 

    54 

    54 

    55 class _llinstruction:  # pytype: disable=ignored-metaclass

    55 class _llinstruction:  # pytype: disable=ignored-metaclass

    57     __metaclass__ = abc.ABCMeta

    56     __metaclass__ = abc.ABCMeta

    58 

    57 

    59     @abc.abstractmethod

    58     @abc.abstractmethod

    60     def __init__(self, op1, op2):

    59     def __init__(self, op1, op2):

    61         pass

    60         pass