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In issue #23911 I worked around a bug [1] in pkg_resources (setuptools) which caused test_venv to fail when I split out importlib._bootstrap_external. That bug has now been fixed so we just(?) need to update the version of pip we're bundling and remove the hack I put in as a workaround (see msg242440).
[1] https://bitbucket.org/pypa/setuptools/issue/378 

Would we be okay fixing this in 3.5 as well? I ask because I'm not familiar with the constraints we have on what pip is bundled.

Donald updated 3.5 to pip 7 for the 1st beta, so the relevant fix may have already been included.

https://hg.python.org/cpython/rev/5c4ba50f6a57
I'll see if that does it.
@Larry, would you be opposed to dropping the hack for beta 3? That would mean just deleting the last 2 lines in Lib/importlib/_bootstrap_external.py.

Sounds okay in theory. Is the bug in question now tested in our regression suite?

Yep. test_venv failures is how I found the problem in the first place.

Then you may fire when ready.

Hmm. Looks like the fix in setuptools/pkg_resources is 17.0. [1] The bundled pip to which we just updated is 7.0.3, which appears to bundle pkg_resources 15.0. [2] So unless I've misunderstood, the hack will have to linger for a bit longer.
Here's a patch for when we get there.
[1] https://bitbucket.org/pypa/setuptools/commits/tag/17.0
[2] https://github.com/pypa/pip/blob/7.0.3/pip/_vendor/README.rst 

New changeset 821663556d87 by Eric Snow in branch 'default':
Issue #24320: Drop an old setuptools-induced hack.
https://hg.python.org/cpython/rev/821663556d87