Refactor DartTypeVisitor and ElementVisitor.

pkg/compiler/lib/src/use_unused_api.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 23 matching lines @@
 import 'source_file_provider.dart' as source_file_provider;
 import 'ssa/ssa.dart' as ssa;
 import 'tree/tree.dart' as tree;
 import 'universe/universe.dart' as universe;
 import 'util/util.dart' as util;
 
 import 'scanner/scannerlib.dart' show
     PartialClassElement,
     PartialFunctionElement;
 
-class ElementVisitor extends elements_visitor.ElementVisitor {
-  visitElement(e) {}
+class ElementVisitor extends elements_visitor.BaseElementVisitor {
+  visitElement(e, a) {}
 }
 
 void main(List<String> arguments) {
   useApi();
   dart2js.main(arguments);
   dart2jslib.isPublicName(null);
   useConstant(null, null);
   useNode(null);
   useUtil(null);
   useSetlet(null);
@@ skipping 91 matching lines @@
   setlet.difference(setlet);
   setlet.retainWhere(null);
 }
 
 void useImmutableEmptySet(util.ImmutableEmptySet set) {
   set.retainWhere(null);
 }
 
 void useElementVisitor(ElementVisitor visitor) {
   visitor
-    ..visit(null)
-    ..visitAbstractFieldElement(null)
-    ..visitAmbiguousElement(null)
-    ..visitBoxFieldElement(null)
-    ..visitClassElement(null)
-    ..visitClosureClassElement(null)
-    ..visitClosureFieldElement(null)
-    ..visitCompilationUnitElement(null)
-    ..visitConstructorBodyElement(null)
-    ..visitElement(null)
-    ..visitErroneousElement(null)
-    ..visitFieldParameterElement(null)
-    ..visitFunctionElement(null)
-    ..visitLibraryElement(null)
-    ..visitMixinApplicationElement(null)
-    ..visitPrefixElement(null)
-    ..visitScopeContainerElement(null)
-    ..visitTypeDeclarationElement(null)
-    ..visitTypeVariableElement(null)
-    ..visitTypedefElement(null)
-    ..visitVariableElement(null)
-    ..visitWarnOnUseElement(null);
+    ..apply(null, null)
+    ..visitAbstractFieldElement(null, null)
+    ..visitAmbiguousElement(null, null)
+    ..visitBoxFieldElement(null, null)
+    ..visitClassElement(null, null)
+    ..visitClosureClassElement(null, null)
+    ..visitClosureFieldElement(null, null)
+    ..visitCompilationUnitElement(null, null)
+    ..visitConstructorBodyElement(null, null)
+    ..visitElement(null, null)
+    ..visitErroneousElement(null, null)
+    ..visitFieldParameterElement(null, null)
+    ..visitFunctionElement(null, null)
+    ..visitLibraryElement(null, null)
+    ..visitMixinApplicationElement(null, null)
+    ..visitPrefixElement(null, null)
+    ..visitScopeContainerElement(null, null)
+    ..visitTypeDeclarationElement(null, null)
+    ..visitTypeVariableElement(null, null)
+    ..visitTypedefElement(null, null)
+    ..visitVariableElement(null, null)
+    ..visitWarnOnUseElement(null, null);
 }
 
 useJsNode(js.Node node) {
   node.asVariableUse();
 }
 
 useJsOther(js.SimpleJavaScriptPrintingContext context) {
   context.getText();
 }
 
@@ skipping 111 matching lines @@
   visitFieldDefinition(tree_ir.FieldDefinition node) {}
 
   visitFieldInitializer(tree_ir.FieldInitializer node) {}
   visitSuperInitializer(tree_ir.SuperInitializer node) {}
 }
 
 useTreeVisitors() {
   new DummyTreeVisitor().visitRootNode(null);
   new DummyTreeVisitor().visitInitializer(null);
 }