Don't make redundant copies of the DFA (#2763)

psf · Jan 14, 2022 · 7a29568 · 7a29568
1 parent 799f76f
commit 7a29568
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/blib2to3/pgen2/parse.py b/src/blib2to3/pgen2/parse.py
@@ -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: