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Python parse tree definitions.

This is a very concrete parse tree; we need to keep every token and
even the comments and whitespace between tokens.

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    Abstract base class for Node and Leaf.

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c	cs�|jdk	st�||jkr2difVn||jkr�x�|jD]�}xwt||�D]f\}}xW|j|||d�D];\}}i}|j|�|j|�|||fVq�WqaWqKWndS(s(Helper to recursively yield the matches.iiN(RlR'RR�R�RuR�Ro(	RRsR�R�R�R�R�R�Rq((s&/usr/lib64/python2.7/lib2to3/pytree.pyR�,s'

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        Initializer.

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        only matches an empty sequence (effectively '$' in regex
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        pattern doesn't have any matches.
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    Generator yielding matches for a sequence of patterns and nodes.

    Args:
        patterns: a sequence of patterns
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        (count, results) tuples where:
        count: the entire sequence of patterns matches nodes[:count];
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