Optional dev-dependencies do not install

[vivekjoshy]

• 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: Ubuntu 20.04 LTS

• Poetry version: 1.0.5

• Link of a Gist with the contents of your pyproject.toml file: pyproject.toml

Issue

Expected Result

poetry install -E "docs tests build_tools" will install extras defined in dev-dependencies

Actual Result

poetry install -E "docs tests build_tools" does not install any of the dev-dependencies.

[ndevln]

Duplicate? #606

[dekoza]

Duplicate of #2073

[vivekjoshy]

#606 is a pull request that was closed. #2073 isn't even about dev-dependencies. Still closing this since #606 mentions that it's not possible to solve.

[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.