Issue python#100: fix the test case test.test_pickler.SizeofTests.tes…

…t_pickler

Adapt the test case to Stackless. Its C struct PicklerObject has an additional member.

https://bitbucket.org/stackless-dev/stackless/issues/100

Lib/test/test_pickle.py

@@ -20,6 +20,12 @@
 except ImportError:
     has_c_implementation = False
 
+try:
+    import stackless
+    has_stackless = True
+except ImportError:
+    has_stackless = False
+
 
 class PickleTests(AbstractPickleModuleTests):
     pass
@@ -146,7 +152,8 @@ class SizeofTests(unittest.TestCase):
         check_sizeof = support.check_sizeof
 
         def test_pickler(self):
-            basesize = support.calcobjsize('5P2n3i2n3iP')
+            basesize = support.calcobjsize('5P2n3i2n3iP' +
+                                           ('P' if has_stackless else ''))
             p = _pickle.Pickler(io.BytesIO())
             self.assertEqual(object.__sizeof__(p), basesize)
             MT_size = struct.calcsize('3nP0n')