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-rw-r--r--lib/sqlalchemy/util/langhelpers.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/util/langhelpers.py b/lib/sqlalchemy/util/langhelpers.py
index 66354f6b6..70c9bba9f 100644
--- a/lib/sqlalchemy/util/langhelpers.py
+++ b/lib/sqlalchemy/util/langhelpers.py
@@ -152,7 +152,7 @@ class safe_reraise:
raise value.with_traceback(traceback)
-def walk_subclasses(cls: type) -> Iterator[type]:
+def walk_subclasses(cls: Type[_T]) -> Iterator[Type[_T]]:
seen: Set[Any] = set()
stack = [cls]