Walrus fix

python-attrs · Apr 13, 2022 · 473428e · 473428e
1 parent d36e8cf
commit 473428e
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/cattrs/_compat.py b/src/cattrs/_compat.py
@@ -135,8 +135,9 @@ def is_union_type(obj):
         )
 
     def get_newtype_base(typ: Any) -> Optional[type]:
+        supertype = getattr(type, "__supertype__", None)
         if (
-            (supertype := getattr(type, "__supertype__", None)) is not None
+            supertype is not None
             and getattr(typ, "__qualname__", "") == "NewType.<locals>.new_type"
             and typ.__module__ in ("typing", "typing_extensions")
         ):