installing pytest on py2.7 doesn't pick up more-itertools

[cjw296]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

build environment: https://circleci.com/gh/cjw296/playground/9
config: https://github.com/cjw296/playground/blob/48364861386eeda9d2592423503fe1c50b94cf1b/pyproject.toml

Issue

poetry fails to install more-itertools on python 2.7, even though it's a dependency of pytest.
The workaround is to separately specify it:

cjw296/playground@035f8b5

Looks like the pytest guys had some fun with this too, so suspect it might be a nasty
edge case: pytest-dev/pytest#4770

[sdispater]

This is still a bug in Poetry though.

Poetry properly locks more-itertools (5.0.0) with the environment markers python_version <= "2.7" or python_version > "2.7" which basically mean any Python version. However for some reason, it skips more-itertools when selecting what to install for Python 2.7: Skipping more-itertools (5.0.0) Not needed for the current environment which is obviously wrong.

I think this is an issue in the installer when resolving packages using the lock file where it seems to drop the python_version <= "2.7" marker.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[md384]

@sdispater @abn can we re-open this ticket? I am still seeing this issue in 1.1.6. Actually happened to me when, I removed an unrelated dependency via poetry remove.

[github-actions]

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