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When using a MANIFEST.in with only "include *.txt", on Windows, distutils grabs too many files. I set DISTUTILS_DEBUG=1 and ran ./setup.py sdist on the keyring library and it included this output:
 include *.txt
 include_pattern: applying regex r'^[^/]*\.txt\Z(?ms)'
 adding CHANGES.txt
 adding CONTRIBUTORS.txt
 adding .hg\last-message.txt
 adding keyring.egg-info\dependency_links.txt
 adding keyring.egg-info\requires.txt
 adding keyring.egg-info\SOURCES.txt
 adding keyring.egg-info\top_level.txt
As you can see, this is not a recursive include, but it's matching several files not in the supplied pattern (files in .hg/ and keyring.egg-info/).
It's obvious from the regular expression that the regex doesn't properly account for os.sep.