Parse parenthesized expressions.

dart/frog/leg/resolver.dart

 // Copyright (c) 2011, 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.
 
 class ResolverTask extends CompilerTask {
   Queue<ClassElement> toResolve;
   ResolverTask(Compiler compiler)
     : super(compiler), toResolve = new Queue<ClassElement>();
 
   String get name() => 'Resolver';
@@ skipping 314 matching lines @@
     visit(node.type);
     VariableDefinitionsVisitor visitor =
         new VariableDefinitionsVisitor(node, this, ElementKind.VARIABLE);
     visitor.visit(node.definitions);
   }
 
   visitWhile(While node) {
     visit(node.condition);
     visitIn(node.body, new Scope(context));
   }
+
+  visitParenthesizedExpression(ParenthesizedExpression node) {
+    visit(node.expression);
+  }
 }
 
 class ClassResolverVisitor extends AbstractVisitor<Type> {
   Compiler compiler;
   Scope context;
 
   ClassResolverVisitor(Compiler compiler)
     : this.compiler = compiler, context = new TopScope(compiler.universe);
 
   Type visitClassNode(ClassNode node) {
@@ skipping 127 matching lines @@
 class TopScope extends Scope {
   Universe universe;
 
   TopScope(Universe this.universe) : super.top();
   Element lookup(SourceString name) => universe.find(name);
 
   Element add(Element element) {
     throw "Cannot add an element in the top scope";
   }
 }