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-rw-r--r--logilab/common/cache.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/logilab/common/cache.py b/logilab/common/cache.py
index 6b673a2..1562111 100644
--- a/logilab/common/cache.py
+++ b/logilab/common/cache.py
@@ -27,7 +27,7 @@ __docformat__ = "restructuredtext en"
from threading import Lock
from logilab.common.decorators import locked
-from typing import Union, TypeVar, List
+from typing import TypeVar, List
_marker = object()