gistfile1.diff

 
+    def test_is_greenlet_local(self, D):
+        greenlet = pytest.importorskip("greenlet")
+        d = wrap_dict(dict)()
+        d['x'] = 42
+
+        def run():
+            assert 'x' not in d._dict
+            d['x'] = 23
+
+        greenlet.greenlet(run).switch()
+        assert 42 == d._dict["x"]
+