Avoid crash in test_typing in refleak hunting mode (#324)

See http://bugs.python.org/issue28649 (this is roughly fix-typing-test-v2.diff)

Author: ilevkivskyi

python2/test_typing.py

@@ -715,9 +715,10 @@ def test_extended_generic_rules_repr(self):
                          'Callable[[], List[int]]')
 
     def test_generic_forvard_ref(self):
-        LLT = List[List['T']]
+        LLT = List[List['CC']]
+        class CC: pass
+        self.assertEqual(typing._eval_type(LLT, globals(), locals()), List[List[CC]])
         T = TypeVar('T')
-        self.assertEqual(typing._eval_type(LLT, globals(), locals()), List[List[T]])
         TTE = Tuple[T, ...]
         self.assertIs(typing._eval_type(TTE, globals(), locals()), Tuple[T, ...])
 

src/test_typing.py

@@ -743,10 +743,11 @@ def test_extended_generic_rules_repr(self):
         self.assertEqual(repr(Callable[[], List[T]][int]).replace('typing.', ''),
                          'Callable[[], List[int]]')
 
-    def test_generic_forvard_ref(self):
-        def foobar(x: List[List['T']]): ...
+    def test_generic_forward_ref(self):
+        def foobar(x: List[List['CC']]): ...
+        class CC: ...
+        self.assertEqual(get_type_hints(foobar, globals(), locals()), {'x': List[List[CC]]})
         T = TypeVar('T')
-        self.assertEqual(get_type_hints(foobar, globals(), locals()), {'x': List[List[T]]})
         def barfoo(x: Tuple[T, ...]): ...
         self.assertIs(get_type_hints(barfoo, globals(), locals())['x'], Tuple[T, ...])