compare test result with CPython

--HG--
rename : tests/run/ref2global.pyx => tests/run/ref2global.py

tests/run/ref2global.pyx → tests/run/ref2global.py

@@ -9,9 +9,11 @@ except ImportError:
 
 def f(a):
     """
-    >>> f(1)
+    Py<=3.3 gives 'global name ...', Py3.4+ only 'name ...'
+
+    >>> f(1)   # doctest: +ELLIPSIS
     Traceback (most recent call last):
-    NameError: name 'definitely_unknown_name' is not defined
+    NameError: ...name 'definitely_unknown_name' is not defined
     """
     a = f
     a = definitely_unknown_name