Add Accessor, Getter, and Setter elements.

pkg/compiler/lib/src/resolution/members.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.
 
 part of resolution;
 
 abstract class TreeElements {
   AnalyzableElement get analyzedElement;
   Iterable<Node> get superUses;
 
@@ skipping 1138 matching lines @@
     if (lookupElement == null) {
       compiler.internalError(member,
           "No abstract field for accessor");
     } else if (!identical(lookupElement.kind, ElementKind.ABSTRACT_FIELD)) {
       if (lookupElement.isErroneous || lookupElement.isAmbiguous) return;
       compiler.internalError(member,
           "Inaccessible abstract field for accessor");
     }
     AbstractFieldElement field = lookupElement;
 
-    FunctionElementX getter = field.getter;
+    MethodElementX getter = field.getter;
     if (getter == null) return;
-    FunctionElementX setter = field.setter;
+    MethodElementX setter = field.setter;
     if (setter == null) return;
     int getterFlags = getter.modifiers.flags | Modifiers.FLAG_ABSTRACT;
     int setterFlags = setter.modifiers.flags | Modifiers.FLAG_ABSTRACT;
     if (!identical(getterFlags, setterFlags)) {
       final mismatchedFlags =
         new Modifiers.withFlags(null, getterFlags ^ setterFlags);
       compiler.reportError(
           field.getter,
           MessageKind.GETTER_MISMATCH,
           {'modifiers': mismatchedFlags});
@@ skipping 3987 matching lines @@
 }
 
 /// The result for the resolution of the `assert` method.
 class AssertResult implements ResolutionResult {
   const AssertResult();
 
   Element get element => null;
 
   String toString() => 'AssertResult()';
 }