18e305dfca
Revert #107376 to fix potential `bincode` breakage and `rustc-perf` benchmark. #107376 caused `rustc-perf`'s `webrender` benchmark to break, by regressing on the `bincode-1.3.3` crate. ~~This PR is a draft revert in case we can't land a fix soon enough, and we'd like to land the revert instead~~ (Though I myself think it'd be safer to do the revert, and run crater when relanding #107376.) cc `@aliemjay`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.