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up 2to3's matching process. After the tree patterns are reduced to
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leaves to the root of the AST and returns a set of nodes for further
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}qq|S )au The main interface with the bottom matcher. The tree is
traversed from the bottom using the constructed
automaton. Nodes are only checked once as the tree is
retraversed. When the automaton fails, we give it one more
shot(in case the above tree matches as a whole with the
rejected leaf), then we break for the next leaf. There is the
special case of multiple arguments(see code comments) where we
recheck the nodes
Args:
The leaves of the AST tree to be matched
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A dictionary of node matches with fixers as the keys
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