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-rw-r--r--Lib/lib2to3/refactor.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index 8100317..c24be14 100644
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -57,7 +57,7 @@ def _get_head_types(pat):
# Always return leafs
if pat.type is None:
raise _EveryNode
- return set([pat.type])
+ return {pat.type}
if isinstance(pat, pytree.NegatedPattern):
if pat.content:
@@ -133,7 +133,7 @@ def _detect_future_features(source):
def advance():
tok = next(gen)
return tok[0], tok[1]
- ignore = frozenset((token.NEWLINE, tokenize.NL, token.COMMENT))
+ ignore = frozenset({token.NEWLINE, tokenize.NL, token.COMMENT})
features = set()
try:
while True: