Not always clear how labels are managed in `rust-lang/rust` (hint: manually). E.g. [#t-infra > Howto create a new feature issue label @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/Howto.20create.20a.20new.20feature.20issue.20label/near/519616578).