WIP: Compute constant expressions in resolution.

tests/compiler/dart2js/serialization_test.dart

 // Copyright (c) 2015, 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.
 
 library dart2js.serialization_test;
 
 import 'dart:io';
 import 'memory_compiler.dart';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/constants/constructors.dart';
@@ skipping 308 matching lines @@
     constructor1.defaultValues.forEach((k, v) {
       checkConstants(
           constructor1, constructor2, 'defaultValue[$k]',
           v, constructor2.defaultValues[k]);
     });
     checkConstants(
         constructor1, constructor2, 'thisConstructorInvocation',
         constructor1.thisConstructorInvocation,
         constructor2.thisConstructorInvocation);
   }
+
+  @override
+  visitErroneous(ErroneousConstantConstructor constructor,
+                 ConstantConstructor arg) {
+    // Do nothing.
+  }
 }
 
 /// Check that the values [property] of [object1] and [object2], [value1] and
 /// [value2] respectively, are equal and throw otherwise.
 void check(var object1, var object2, String property, var value1, value2) {
   if (value1 != value2) {
     throw "$object1.$property = '${value1}' <> "
           "$object2.$property = '${value2}'";
   }
 }
@@ skipping 749 matching lines @@
         exp1, exp2, 'expression',
         exp1.expression, exp2.expression);
   }
 
   @override
   visitDeferred(DeferredConstantExpression exp1,
                 DeferredConstantExpression exp2) {
     // TODO: implement visitDeferred
   }
 }