Simplify redundant isinstance check

pquentin · pquentin · commit 397f67e03e8a · 2020-09-18T14:04:29.000+04:00
diff --git a/trio/tests/test_exports.py b/trio/tests/test_exports.py
@@ -141,4 +141,4 @@ def test_classes_are_final():
                 continue
             # ... insert other special cases here ...
 
-            assert isinstance(class_, (_util.Final, _util.Final))
+            assert isinstance(class_, _util.Final)
