Problem parsing requirement markers

[lvkswrks]

• 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).

• OS version and name: OSX

• Poetry version: 0.12.11

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/lvkswrks/9967aeedc34f967efeda9c9d429efb5f

Issue

Poetry seems to have problems parsing requirement markers as illustrated below

setup(
    # ...
    install_requires = [
        'pyarrow==0.9.0;platform_system!="darwin"',
        'pyarrow==0.9.post1;platform_system=="darwin"',
    ],
)

It will fall into an infinite recursion and crash at some point with

0: Duplicate dependencies for pyarrow
0: Different requirements found for pyarrow (0.9.0) and pyarrow (0.9.post1).
1: Version solving took 0.056 seconds.
1: Tried 1 solutions.
0: Retrying dependency resolution for Python (>=3.6,<4.0).
1: fact: test-multiline is 0.1.0
1: derived: test-multiline
1: fact: test-multiline depends on py-setup (*)

Please also see a minimal example project configuration I uploaded to Gist.

[lvkswrks]

I tested with poetry 0.12.15 and it is still an issue.

[lvkswrks]

The error still persists in Poetry 0.12.17.

poetry install -vvv
Using virtualenv: /path/to/.venv
Updating dependencies
Resolving dependencies...
   1: fact: test-multiline is 0.1.0
   1: derived: test-multiline
   1: fact: test-multiline depends on py-setup (*)
   1: selecting test-multiline (0.1.0)
   1: derived: py-setup (*)
   0: Duplicate dependencies for pyarrow
   0: Different requirements found for pyarrow (0.9.0) and pyarrow (0.9.post1).
   1: Version solving took 0.221 seconds.
   1: Tried 1 solutions.
   0: Retrying dependency resolution for Python (>=3.6,<4.0).
   1: fact: test-multiline is 0.1.0
   1: derived: test-multiline
   1: fact: test-multiline depends on py-setup (*)
   1: selecting test-multiline (0.1.0)
   1: derived: py-setup (*)
   0: Duplicate dependencies for pyarrow
   0: Different requirements found for pyarrow (0.9.0) and pyarrow (0.9.post1).
   1: Version solving took 0.004 seconds.
   1: Tried 1 solutions.

[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.

[lvkswrks]

Hi, the issue persists in 1.0.0.b.

[s0undt3ch]

The issue still exists in latest release, see #1238 (comment)

[s0undt3ch]

Though, I hit a Max recursion error.

[g4b1nagy]

This has been fixed in the 1.1.X branch of Poetry. So every version starting from 1.1.0 (Oct 1, 2020) should work just fine.
Note that:

lock files generated with this release are not compatible with previous releases of Poetry.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.