Use Entity instead of Element in ConstantValue

pkg/compiler/lib/src/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.
 
 library dart2js.compile_time_constant_evaluator;
 
 import 'common/resolution.dart' show Resolution;
 import 'common/tasks.dart' show CompilerTask, Measurer;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
@@ skipping 619 matching lines @@
     }
     return signalNotCompileTimeConstant(node);
   }
 
   // TODO(floitsch): provide better error-messages.
   AstConstant visitSend(Send send) {
     Element element = elements[send];
     if (send.isPropertyAccess) {
       AstConstant result;
       if (Elements.isStaticOrTopLevelFunction(element)) {
-        FunctionElement function = element;
+        MethodElement function = element;
         function.computeType(resolution);
         result = new AstConstant(
             context,
             send,
             new FunctionConstantExpression(function),
-            new FunctionConstantValue(function));
+            new FunctionConstantValue(function, function.type));
       } else if (Elements.isStaticOrTopLevelField(element)) {
         ConstantExpression elementExpression;
         if (element.isConst) {
           elementExpression = handler.compileConstant(element);
         } else if (element.isFinal && !isEvaluatingConstant) {
           elementExpression = handler.compileVariable(element);
         }
         if (elementExpression != null) {
           result = new AstConstant(
               context,
@@ skipping 786 matching lines @@
 class _CompilerEnvironment implements Environment {
   final Compiler compiler;
 
   _CompilerEnvironment(this.compiler);
 
   @override
   String readFromEnvironment(String name) {
     return compiler.fromEnvironment(name);
   }
 }