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I am running the following command
$ python -m trace -C pickle-trace.d -c -m Lib/test/test_pickle.py
and getting attached file, pickle.cover, in the pickle-trace.d directory. This does not look right. From the very beginning, module level statements are marked as not executed:
>>>>>> __version__ = "$Revision: 82937 $" # Code version
 
>>>>>> from types import FunctionType, BuiltinFunctionType
>>>>>> from copyreg import dispatch_table
>>>>>> from copyreg import _extension_registry, _inverted_registry, _extension_cache
>>>>>> import marshal
>>>>>> import sys
The method I was interested in, _instantiate, shows as if it was never executed even though if I add a failing assert, I do see test failure.
I suspect that this may have something to do with the import trickery that test_pickle does to test with and without _pickle.