squash sets warning

diff --git a/lib/sqlalchemy/util/compat.py b/lib/sqlalchemy/util/compat.py
index 9dac22b3c9cbecfd4a7318b7302623001c81b673..961aa1f8a0f50551f0cb10a264be1f2f40236595 100644 (file)
--- a/lib/sqlalchemy/util/compat.py
+++ b/lib/sqlalchemy/util/compat.py
@@ -24,6 +24,7 @@ else:
     # 2.6 deprecates sets.Set, but we still need to be able to detect them
     # in user code and as return values from DB-APIs
     ignore = ('ignore', None, DeprecationWarning, None, 0)
+    import warnings
     try:
         warnings.filters.insert(0, ignore)
     except Exception: