Layered requirements and pyproject.toml

[gchaperon]

When trying to use layered requirements in pyproject.toml, pip-compile fails.

Using the following pyproject.toml file

[build-system]
requires = ["setuptools", "wheel"]
build-backend = "setuptools.build_meta"

[project]
name = "not-in-pypi"
version = "0.1.0"
dependencies = [
    "click",
    "numpy",
    "scikit-learn",
]

[project.optional-dependencies]
test = ["pytest"]
dev = ["not-in-pypi[test]", "ipython"]

and running pip-compile -o dev-requirements.txt --extra dev pyproject.toml (same command as in the docs), pip-compile fails with

Could not find a version that matches not-in-pypi[test] (from not-in-pypi (pyproject.toml))
No versions found
Was https://pypi.org/simple reachable?

However trying to install the package with pip install .[dev] works perfectly fine.

I think this usage of optional dependencies is supported by pip, given this and this comments.

Environment Versions

1. OS Type : linux
2. Python version: Python 3.10.9
3. pip version: pip 22.3.1 from /home/gchapero/projects/pip-tools-bug/env/lib/python3.10/site-packages/pip (python 3.10)
4. pip-tools version: pip-compile, version 6.12.3

Steps to replicate

1. Using the pyproject.toml file described above, run pip-compile --extra dev -o dev-requirements.txt pyproject.toml

Expected result

A dev-requirements.txt file.

Actual result

An error.

[atugushev]

Duplicate of #1685.

[AndydeCleyre]

Thanks for linking those comments, I had no idea listing a package as a dependency of itself might be a supported pattern.