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Don't make redundant copies of the DFA #2763

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Jan 14, 2022
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Don't make redundant copies of the DFA #2763

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2 changes: 1 addition & 1 deletion src/blib2to3/pgen2/parse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,7 @@ def stack_copy(
stack: List[Tuple[DFAS, int, RawNode]]
) -> List[Tuple[DFAS, int, RawNode]]:
"""Nodeless stack copy."""
return [(copy.deepcopy(dfa), label, DUMMY_NODE) for dfa, label, _ in stack]
return [(dfa, label, DUMMY_NODE) for dfa, label, _ in stack]


class Recorder:
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