Visit parenthesized expressions in compile-time constants.

frog/leg/compile_time_constants.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.
 
 class Constant implements Hashable {
   const Constant();
 
   bool isNull() => false;
   bool isBool() => false;
   bool isTrue() => false;
@@ skipping 675 matching lines @@
                                                  this.compiler,
                                                  this.definitions);
 
   bool insideConstructor() => definitions !== null;
 
   Constant evaluate(Node node) {
     return node.accept(this);
   }
 
   visitNode(Node node) {
-    compiler.unimplemented("CompileTimeConstantEvaluator", node: node);
+    error(node);
   }
 
   Constant visitLiteralBool(LiteralBool node) {
     // TODO(floitsch): make BoolConstant a factory and cache the two values
     // there.
     return new BoolConstant(node.value);
   }
 
   Constant visitLiteralDouble(LiteralDouble node) {
     return new DoubleConstant(node.value);
@@ skipping 342 matching lines @@
 
 
     compiler.registerInstantiatedClass(classElement);
     // TODO(floitsch): take generic types into account.
     Type type = classElement.computeType(compiler);
     Constant constant = new ConstructedConstant(type, jsNewArguments);
     constantHandler.registerCompileTimeConstant(constant);
     return constant;
   }
 
+  Constant visitParenthesizedExpression(ParenthesizedExpression node) {
+    return node.expression.accept(this);
+  }
+
   error(Node node) {
     // TODO(floitsch): get the list of constants that are currently compiled
     // and present some kind of stack-trace.
     MessageKind kind = MessageKind.NOT_A_COMPILE_TIME_CONSTANT;
     compiler.reportError(node, new CompileTimeConstantError(kind, const []));
   }
 }