Remove mutable_borrow_reservation_conflict lint and allow the code pattern This was the only breaking issue with the NLL stabilization PR. Lang team decided to go ahead and allow this. r? `@nikomatsakis` Closes #59159 Closes #56254
span_suggestion
impl ToString
Symbol::as_str()
AdtDef
MultiSpan
~const Drop
~const Destruct
DefIdTree::parent