move test_trace.py so as not to conflict with future tests for the trace module

Lib/test/test_scope.py

@@ -690,6 +690,14 @@ result2 = h()
         h = g()
         self.assertEqual(h(), 3)
 
+    def testLocalClosureShadowing(self):
+        exec("""
+x = 4
+def f(x):
+    class C:
+         x = x
+raises(NameError, f, 3)""", {"raises" : self.assertRaises})
+
 
 def test_main():
     run_unittest(ScopeTests)