Auto merge of #94584 - pnkfelix:inject-use-suggestion-sites, r=ekuber

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

compiler/rustc_ast_lowering/src/lib.rs

@@ -452,7 +452,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         visit::walk_crate(&mut item::ItemLowerer { lctx: &mut self }, c);
 
         self.with_hir_id_owner(CRATE_NODE_ID, |lctx| {
-            let module = lctx.lower_mod(&c.items, c.span);
+            let module = lctx.lower_mod(&c.items, c.spans.inner_span);
             lctx.lower_attrs(hir::CRATE_HIR_ID, &c.attrs);
             hir::OwnerNode::Crate(lctx.arena.alloc(module))
         });