65386c045e
Implement `debug_more_non_exhaustive` This implements the ACP at https://github.com/rust-lang/libs-team/issues/248, adding `.finish_non_exhaustive()` for `DebugTuple`, `DebugSet`, `DebugList`, and `DebugMap`. Also used this as an opportunity to make some documentation and tests more readable by using raw strings instead of escaped quotes. Tracking issue: https://github.com/rust-lang/rust/issues/127942