WIP: Compute constant expressions in resolution.

pkg/compiler/lib/src/types/constants.dart

 // Copyright (c) 2014, 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 types.constants;
 
 import '../common.dart';
 import '../compiler.dart' show
     Compiler;
 import '../constants/values.dart';
@@ skipping 97 matching lines @@
 
   @override
   TypeMask visitString(StringConstantValue constant, Compiler compiler) {
     return compiler.typesTask.stringType;
   }
 
   @override
   TypeMask visitType(TypeConstantValue constant, Compiler compiler) {
     return compiler.typesTask.typeType;
   }
+
+  @override
+  TypeMask visitNonConstant(NonConstantValue constant,
+                            Compiler compiler) {
+    return compiler.typesTask.dynamicType;
+  }
 }