Report a fatal error on attempt to rename an element declared in SDK.

pkg/analysis_server/test/services/refactoring/rename_class_member_test.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 test.services.refactoring.rename_class_member;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/correction/status.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 223 matching lines @@
     createRenameRefactoringAtString('test() {}');
     // check status
     refactoring.newName = 'newName';
     RefactoringStatus status = await refactoring.checkFinalConditions();
     assertRefactoringStatus(status, RefactoringProblemSeverity.ERROR,
         expectedMessage:
             "Renamed method will be shadowed by method 'B.newName'.",
         expectedContextSearch: 'newName() {} // marker');
   }
 
+  test_checkInitialConditions_inSDK() async {
+    indexTestUnit('''
+main() {
+  'abc'.toUpperCase();
+}
+''');
+    createRenameRefactoringAtString('toUpperCase()');
+    // check status
+    refactoring.newName = 'NewName';
+    RefactoringStatus status = await refactoring.checkInitialConditions();
+    assertRefactoringStatus(status, RefactoringProblemSeverity.FATAL,
+        expectedMessage:
+            "The method 'String.toUpperCase' is defined in the SDK, so cannot be renamed.");
+  }
+
   test_checkInitialConditions_operator() async {
     indexTestUnit('''
 class A {
   operator -(other) => this;
 }
 ''');
     createRenameRefactoringAtString('-(other)');
     // check status
     refactoring.newName = 'newName';
     RefactoringStatus status = await refactoring.checkInitialConditions();
@@ skipping 476 matching lines @@
     // validate change
     return assertSuccessfulRefactoring('''
 class A<NewName> {
   NewName field;
   List<NewName> items;
   NewName method(NewName p) => null;
 }
 ''');
   }
 }