Remove the final error being generated in a scope

pkg/analyzer/lib/src/generated/element_resolver.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 analyzer.src.generated.element_resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 2435 matching lines @@
             setter = _lookUpSetter(null, enclosingClass.type, identifier.name);
           }
         }
         if (setter != null) {
           element = setter;
         }
       }
     } else if (element == null &&
         (identifier.inSetterContext() ||
             identifier.parent is CommentReference)) {
-      element = _resolver.nameScope.lookup(
-          new SyntheticIdentifier("${identifier.name}=", identifier),
-          _definingLibrary);
+      Identifier setterId =
+          new SyntheticIdentifier('${identifier.name}=', identifier);
+      element = _resolver.nameScope.lookup(setterId, _definingLibrary);
+      identifier.setProperty(LibraryImportScope.conflictingSdkElements,
+          setterId.getProperty(LibraryImportScope.conflictingSdkElements));
     }
     ClassElement enclosingClass = _resolver.enclosingClass;
     if (element == null && enclosingClass != null) {
       InterfaceType enclosingType = enclosingClass.type;
       if (element == null &&
           (identifier.inSetterContext() ||
               identifier.parent is CommentReference)) {
         element = _lookUpSetter(null, enclosingType, identifier.name);
       }
       if (element == null && identifier.inGetterContext()) {
@@ skipping 165 matching lines @@
 
   @override
   Element get staticElement => null;
 
   @override
   dynamic/*=E*/ accept/*<E>*/(AstVisitor/*<E>*/ visitor) => null;
 
   @override
   void visitChildren(AstVisitor visitor) {}
 }