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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.
There's also a pattern matching implementation here.
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Abstract base class for Node and Leaf.
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Compare two nodes for equality.
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A pattern is a tree matching pattern.
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max: optional maximum number of times to match, default HUGE
name: optional name assigned to this match
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equivalent to (a b c | d e | f g h); if content is None,
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