Rollup merge of #88232 - m-ou-se:macro-name-imported-but-not-macro, r=estebank

Add notes to macro-not-found diagnostics to point out how things with the same name were not a match.

This adds notes like:
```
error: cannot find derive macro `Serialize` in this scope
  --> $DIR/issue-88206.rs:22:10
   |
LL | #[derive(Serialize)]
   |          ^^^^^^^^^
   |
note: `Serialize` is imported here, but it is not a derive macro
  --> $DIR/issue-88206.rs:17:11
   |
LL | use hey::{Serialize, Deserialize};
   |           ^^^^^^^^^
```

Fixes https://github.com/rust-lang/rust/issues/88206

Includes https://github.com/rust-lang/rust/pull/88229

r? `@estebank`

compiler/rustc_resolve/src/diagnostics.rs

@@ -956,9 +956,61 @@ impl<'a> Resolver<'a> {
         if macro_kind == MacroKind::Derive && (ident.name == sym::Send || ident.name == sym::Sync) {
             let msg = format!("unsafe traits like `{}` should be implemented explicitly", ident);
             err.span_note(ident.span, &msg);
+            return;
         }
         if self.macro_names.contains(&ident.normalize_to_macros_2_0()) {
             err.help("have you added the `#[macro_use]` on the module/import?");
+            return;
+        }
+        for ns in [Namespace::MacroNS, Namespace::TypeNS, Namespace::ValueNS] {
+            if let Ok(binding) = self.early_resolve_ident_in_lexical_scope(
+                ident,
+                ScopeSet::All(ns, false),
+                &parent_scope,
+                false,
+                false,
+                ident.span,
+            ) {
+                let desc = match binding.res() {
+                    Res::Def(DefKind::Macro(MacroKind::Bang), _) => {
+                        "a function-like macro".to_string()
+                    }
+                    Res::Def(DefKind::Macro(MacroKind::Attr), _) | Res::NonMacroAttr(..) => {
+                        format!("an attribute: `#[{}]`", ident)
+                    }
+                    Res::Def(DefKind::Macro(MacroKind::Derive), _) => {
+                        format!("a derive macro: `#[derive({})]`", ident)
+                    }
+                    Res::ToolMod => {
+                        // Don't confuse the user with tool modules.
+                        continue;
+                    }
+                    Res::Def(DefKind::Trait, _) if macro_kind == MacroKind::Derive => {
+                        "only a trait, without a derive macro".to_string()
+                    }
+                    res => format!(
+                        "{} {}, not {} {}",
+                        res.article(),
+                        res.descr(),
+                        macro_kind.article(),
+                        macro_kind.descr_expected(),
+                    ),
+                };
+                if let crate::NameBindingKind::Import { import, .. } = binding.kind {
+                    if !import.span.is_dummy() {
+                        err.span_note(
+                            import.span,
+                            &format!("`{}` is imported here, but it is {}", ident, desc),
+                        );
+                        // Silence the 'unused import' warning we might get,
+                        // since this diagnostic already covers that import.
+                        self.record_use(ident, binding, false);
+                        return;
+                    }
+                }
+                err.note(&format!("`{}` is in scope, but it is {}", ident, desc));
+                return;
+            }
         }
     }