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A bottom-up tree matching algorithm implementation meant to speed
up 2to3's matching process. After the tree patterns are reduced to
their rarest linear path, a linear Aho-Corasick automaton is
created. The linear automaton traverses the linear paths from the
leaves to the root of the AST and returns a set of nodes for further
matching. This reduces significantly the number of candidate nodes.s+George Boutsioukis <gboutsioukis@gmail.com>i����N(
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Wn|j}q+WqW|S(suThe main interface with the bottom matcher. The tree is
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        shot(in case the above tree matches as a whole with the
        rejected leaf), then we break for the next leaf. There is the
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        Args:
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           A dictionary of node matches with fixers as the keys
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