Fix feature detection for positional-only arguments in lambdas

[Zac-HD]

Description

While working on shed, I discovered that feature detection for positional-only arguments doesn't work in lambdas, though the docstring of get_features_used() suggests that it should. I've therefore added syms.varargslist to the check, and a test case which demonstrates that it works.

Checklist

• Added a CHANGELOG entry
• Added test cases
• This change does not need documentation

[ghost]

Shed? It's not black anymore?

…

On Mon, Oct 11, 2021, 21:50 Zac Hatfield-Dodds ***@***.***> wrote: Description While working on shed, I discovered that feature detection for positional-only arguments doesn't work in lambdas, though the docstring of get_features_used() suggests that it should. I've therefore added syms.varargslist to the check, and a test case which demonstrates that it works. Checklist - Added a CHANGELOG entry - Added test cases - This change does not need documentation ------------------------------ You can view, comment on, or merge this pull request online at: #2532 Commit Summary - Detect pos-only args in lambdas <93e8c45> File Changes - *M* CHANGES.md <https://github.com/psf/black/pull/2532/files#diff-d975bf659606195d2165918f93e1cf680ef68ea3c9cab994f033705fea8238b2> (1) - *M* src/black/__init__.py <https://github.com/psf/black/pull/2532/files#diff-d23a6917d7262ca9815093bffb7148299e516575251959ed9b405b648e76aa29> (6) - *M* tests/test_black.py <https://github.com/psf/black/pull/2532/files#diff-5d18894e01294dc4bbb737e1a301ecc1e83e794894de9f5334fa0175f79267f5> (4) Patch Links: - https://github.com/psf/black/pull/2532.patch - https://github.com/psf/black/pull/2532.diff — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2532>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ARZEIISNRXFWNMUGPE2XDNLUGOA4BANCNFSM5FZLGKNQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[Zac-HD]

Shed? It's not black anymore?

https://github.com/Zac-HD/shed is my downstream autoformatter; it includes Black but also wraps tools like isort and some custom refactoring logic.