expand: Simplify expansion of derives

And make it more uniform with other macros.
By merging placeholders for future derives' outputs into the derive container's output fragment early.

src/librustc_resolve/build_reduced_graph.rs

@@ -163,25 +163,15 @@ impl<'a> Resolver<'a> {
         Some(ext)
     }
 
-    // FIXME: `extra_placeholders` should be included into the `fragment` as regular placeholders.
     crate fn build_reduced_graph(
         &mut self,
         fragment: &AstFragment,
-        extra_placeholders: &[NodeId],
         parent_scope: ParentScope<'a>,
     ) -> LegacyScope<'a> {
         let mut def_collector = DefCollector::new(&mut self.definitions, parent_scope.expansion);
         fragment.visit_with(&mut def_collector);
-        for placeholder in extra_placeholders {
-            def_collector.visit_macro_invoc(*placeholder);
-        }
-
         let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope };
         fragment.visit_with(&mut visitor);
-        for placeholder in extra_placeholders {
-            visitor.parent_scope.legacy = visitor.visit_invoc(*placeholder);
-        }
-
         visitor.parent_scope.legacy
     }
 

src/librustc_resolve/macros.rs

@@ -108,15 +108,11 @@ impl<'a> base::Resolver for Resolver<'a> {
         });
     }
 
-    // FIXME: `extra_placeholders` should be included into the `fragment` as regular placeholders.
-    fn visit_ast_fragment_with_placeholders(
-        &mut self, expansion: ExpnId, fragment: &AstFragment, extra_placeholders: &[NodeId]
-    ) {
+    fn visit_ast_fragment_with_placeholders(&mut self, expansion: ExpnId, fragment: &AstFragment) {
         // Integrate the new AST fragment into all the definition and module structures.
         // We are inside the `expansion` now, but other parent scope components are still the same.
         let parent_scope = ParentScope { expansion, ..self.invocation_parent_scopes[&expansion] };
-        let output_legacy_scope =
-            self.build_reduced_graph(fragment, extra_placeholders, parent_scope);
+        let output_legacy_scope = self.build_reduced_graph(fragment, parent_scope);
         self.output_legacy_scopes.insert(expansion, output_legacy_scope);
 
         parent_scope.module.unexpanded_invocations.borrow_mut().remove(&expansion);