95561b336c
More robust fallback for `use` suggestion Our old way to suggest where to add `use`s would first look for pre-existing `use`s in the relevant crate/module, and if there are *no* uses, it would fallback on trying to use another item as the basis for the suggestion. But this was fragile, as illustrated in issue #87613 This PR instead identifies span of the first token after any inner attributes, and uses *that* as the fallback for the `use` suggestion. Fix #87613
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.