Parse parenthesized expressions.

dart/frog/leg/ssa/builder.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 SsaBuilderTask extends CompilerTask {
   SsaBuilderTask(Compiler compiler) : super(compiler);
   String get name() => 'SSA builder';
 
   HGraph build(Node tree, Map<Node, Element> elements) {
     return measure(() {
@@ skipping 494 matching lines @@
   void visitLiteralNull(LiteralNull node) {
     push(new HLiteral(null));
   }
 
   visitNodeList(NodeList node) {
     for (Link<Node> link = node.nodes; !link.isEmpty(); link = link.tail) {
       visit(link.head);
     }
   }
 
+  void visitParenthesizedExpression(ParenthesizedExpression node) {
+    visit(node.expression);
+  }
+
   visitOperator(Operator node) {
     // Operators are intercepted in their surrounding Send nodes.
     unreachable();
   }
 
   visitReturn(Return node) {
     HInstruction value;
     if (node.expression === null) {
       value = new HLiteral(null);
       add(value);
@@ skipping 26 matching lines @@
         add(initialValue);
         updateDefinition(definition, initialValue);
       } else {
         assert(definition is SendSet);
         visitSendSet(definition);
         pop();  // Discard value.
       }
     }
   }
 }