mirror of
https://github.com/CHN-beta/nixpkgs.git
synced 2026-01-21 15:30:27 +08:00
In PR #96456, black was upgraded from 19.10b0 to 20.8b1. This new version of black depends on the dataclasses module, but that was only introduced into the standard library in Python 3.7; earlier versions of Python require the backport package of the same name. This commit addresses the missing dependency.