Issue #6137: The pickle module now translates module names when loading

or dumping pickles with a 2.x-compatible protocol, in order to make data
sharing and migration easier. This behaviour can be disabled using the
new `fix_imports` optional argument.

Lib/test/test_pickletools.py

@@ -12,6 +12,9 @@ class OptimizedPickleTests(AbstractPickleTests, AbstractPickleModuleTests):
     def loads(self, buf):
         return pickle.loads(buf)
 
+    # Test relies on precise output of dumps()
+    test_pickle_to_2x = None
+
 
 def test_main():
     support.run_unittest(OptimizedPickleTests)