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-rw-r--r--Lib/shutil.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/shutil.py b/Lib/shutil.py
index 1c3a75d..d108986 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -454,7 +454,7 @@ def _copytree(entries, src, dst, symlinks, ignore, copy_function,
if ignore is not None:
ignored_names = ignore(os.fspath(src), [x.name for x in entries])
else:
- ignored_names = set()
+ ignored_names = ()
os.makedirs(dst, exist_ok=dirs_exist_ok)
errors = []