Matthias Krüger 76994625f8
Rollup merge of #108930 - Ezrashaw:better-error-for-manual-fn-impl, r=petrochenkov
feat: implement better error for manual impl of `Fn*` traits

Fixes #39259

cc `@estebank` (you gave me some advice in the linked issue, would you like to review?)
2023-03-10 19:59:19 +01:00
..