expand/resolve: Turn #[derive] into a regular macro attribute

compiler/rustc_resolve/src/lib.rs

@@ -967,6 +967,8 @@ pub struct Resolver<'a> {
     output_macro_rules_scopes: FxHashMap<ExpnId, MacroRulesScopeRef<'a>>,
     /// Helper attributes that are in scope for the given expansion.
     helper_attrs: FxHashMap<ExpnId, Vec<Ident>>,
+    /// Resolutions for paths inside the `#[derive(...)]` attribute with the given `ExpnId`.
+    derive_resolutions: FxHashMap<ExpnId, Vec<(Lrc<SyntaxExtension>, ast::Path)>>,
 
     /// Avoid duplicated errors for "name already defined".
     name_already_seen: FxHashMap<Symbol, Span>,
@@ -1295,6 +1297,7 @@ impl<'a> Resolver<'a> {
             invocation_parent_scopes: Default::default(),
             output_macro_rules_scopes: Default::default(),
             helper_attrs: Default::default(),
+            derive_resolutions: Default::default(),
             local_macro_def_scopes: FxHashMap::default(),
             name_already_seen: FxHashMap::default(),
             potentially_unused_imports: Vec::new(),