Versioned extra_requires are always installed

[felixonmars]

Since the update from 2.9 -> 2.10.1, the conditional dependency enum34 of h2 is always installed when running pytest-runner, but I am running with Python 3.6 and it shouldn't be installed.

The related entry is:

    extras_require={
        ':python_version == "2.7" or python_version == "3.3"': ['enum34>=1.0.4, <2'],
    }

Downgrading pytest-runner to 2.9 without any other changes fixes the behavior for me.

[felixonmars]

Full logs:

With pytest-runner 2.9:

running pytest
running egg_info
writing h2.egg-info/PKG-INFO
writing dependency_links to h2.egg-info/dependency_links.txt
writing requirements to h2.egg-info/requires.txt
writing top-level names to h2.egg-info/top_level.txt
reading manifest template 'MANIFEST.in'
writing manifest file 'h2.egg-info/SOURCES.txt'
running build_ext
=================================================================== test session starts ===================================================================
platform linux -- Python 3.6.0, pytest-3.0.6, py-1.4.32, pluggy-0.4.0
...

With pytest-runner 2.10.1:

running pytest
Searching for enum34<2,>=1.0.4
Reading https://pypi.python.org/simple/enum34/
Downloading https://pypi.python.org/packages/e8/26/a6101edcf724453845c850281b96b89a10dac6bd98edebc82634fccce6a5/enum34-1.1.6.zip#md5=61ad7871532d4ce2d77fac2579237a9e
Best match: enum34 1.1.6
Processing enum34-1.1.6.zip
Writing /tmp/easy_install-7e0gi_23/enum34-1.1.6/setup.cfg
Running enum34-1.1.6/setup.py -q bdist_egg --dist-dir /tmp/easy_install-7e0gi_23/enum34-1.1.6/egg-dist-tmp-f_6lcb7f
...

[jaraco]

Indeed, looks like a lot changed. I'll see if I can break into the code and see what's going on.

[jaraco]

I believe the error is corrected in the commit above. I tested 2.11.1 against h2 and it doesn't pull down enum34 on Python 3.6 but does on Python 2.7. Feel free to double-check my work as well.

[felixonmars]

Confirmed that 2.11.1 works correctly. Thank you!