Install an extra via environment markers

[matrixise]

Environment Versions

1. OS Type - Linux, macOS
2. Python version: $ python -V 3.10.1
3. pip version: $ pip --version 21.3.1
4. pip-tools version: $ pip-compile --version 6.4.0

Steps to replicate

in a requirements.in, I try to install spacy for non M1 chip and spacy[apple] for M1

spacy; platform_machine != 'arm64'
spacy[apple]; sys_platform == 'darwin' and platform_machine == 'arm64'

Expected result

in the requirements.txt

spacy; platform_machine != 'arm64'
spacy[apple]; sys_platform == 'darwin' and platform_machine == 'arm64'

Actual result

spacy; platform_machine != 'arm64'

I would like to be honest, I am not sure about the syntax for the installation of an extra via the environment markers. Do you have some advices?

Thank you

[AndydeCleyre]

I think this is currently working as intended.. Might this be a duplicate of #1553 or #1326?

[AndydeCleyre]

I'm going to close this in favor of concentrating relevant discussion at #1326, thanks!