Fix test_inheritance test.

Lib/test/test_baseexception.py

@@ -77,6 +77,10 @@ class ExceptionClassTests(unittest.TestCase):
                 last_depth = depth
         finally:
             inheritance_tree.close()
+
+        # RUSTPYTHON specific
+        exc_set.discard("JitError")
+
         self.assertEqual(len(exc_set), 0, "%s not accounted for" % exc_set)
 
     interface_tests = ("length", "args", "str", "repr")