Non fatal errors on duplicated accessors

dart/pkg/compiler/lib/src/resolution/class_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.
 
 library resolution.compute_members;
 
 import '../elements/elements.dart'
     show Element,
          Name,
          PublicName,
@@ skipping 330 matching lines @@
               compiler.reportInfo(superMember.element,
                   MessageKind.INSTANCE_STATIC_SAME_NAME_CONT);
             });
             break;
           }
           superclass = superclass.superclass;
         }
       }
     } else {
       assert(declared.name == superMember.name);
+
       if (declared.isStatic) {
         for (Member inherited in superMember.declarations) {
+          if (cls == inherited.declarer.element) {
+            // An error should already have been reported.
+            assert(invariant(declared.element, compiler.compilationFailed));
+            continue;
+          }
+
           reportMessage(
               inherited.element, MessageKind.NO_STATIC_OVERRIDE, () {
             reportErrorWithContext(
                 declared.element, MessageKind.NO_STATIC_OVERRIDE,
                 inherited.element, MessageKind.NO_STATIC_OVERRIDE_CONT);
           });
         }
       }
 
       DartType declaredType = declared.functionType;
       for (Member inherited in superMember.declarations) {
+        if (cls == inherited.declarer.element) {
+          // An error should already have been reported.
+          assert(invariant(declared.element, compiler.compilationFailed));
+          continue;
+        }
 
         void reportError(MessageKind errorKind, MessageKind infoKind) {
           reportMessage(
               inherited.element, MessageKind.INVALID_OVERRIDE_METHOD, () {
             compiler.reportError(declared.element, errorKind,
                 {'name': declared.name.text,
                  'class': cls.thisType,
                  'inheritedClass': inherited.declarer});
             compiler.reportInfo(inherited.element, infoKind,
                 {'name': declared.name.text,
@@ skipping 515 matching lines @@
         message: "Members have not been fully computed for $this."));
     if (interfaceMembersAreClassMembers) {
       classMembers.forEach((_, member) {
         if (!member.isStatic) f(member);
       });
     } else {
       interfaceMembers.forEach((_, member) => f(member));
     }
   }
 }