Re-evaluate forward references if non-trivial localns is given (#328)

Author: ilevkivskyi

python2/typing.py

@@ -207,7 +207,7 @@ def __init__(self, arg):
         self.__forward_value__ = None
 
     def _eval_type(self, globalns, localns):
-        if not self.__forward_evaluated__:
+        if not self.__forward_evaluated__ or localns is not globalns:
             if globalns is None and localns is None:
                 globalns = localns = {}
             elif globalns is None:

src/typing.py

@@ -218,7 +218,7 @@ def __init__(self, arg):
         self.__forward_value__ = None
 
     def _eval_type(self, globalns, localns):
-        if not self.__forward_evaluated__:
+        if not self.__forward_evaluated__ or localns is not globalns:
             if globalns is None and localns is None:
                 globalns = localns = {}
             elif globalns is None: