Fix a bizarre error where test_pickletools fails if preceded by test_pyclbr. The fix is in neither, but in pickle.py where a loop over sys.modules.items() could modify sys.modules, occasionally.
Fix a bizarre error where test_pickletools fails if preceded by test_pyclbr.
The fix is in neither, but in pickle.py where a loop over sys.modules.items()
could modify sys.modules, occasionally.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator