Issue 18926. Rename refactoring for labels.

pkg/analysis_server/lib/src/services/refactoring/refactoring.dart

Index: pkg/analysis_server/lib/src/services/refactoring/refactoring.dart
diff --git a/pkg/analysis_server/lib/src/services/refactoring/refactoring.dart b/pkg/analysis_server/lib/src/services/refactoring/refactoring.dart
index fac12c1009bd4dd6dea556535a9c7aa01a6433ee..25f76e9585d26a280c104f4befc376c4d192ef71 100644
--- a/pkg/analysis_server/lib/src/services/refactoring/refactoring.dart
+++ b/pkg/analysis_server/lib/src/services/refactoring/refactoring.dart
@@ -16,6 +16,7 @@ import 'package:analysis_server/src/services/refactoring/inline_method.dart';
 import 'package:analysis_server/src/services/refactoring/rename_class_member.dart';
 import 'package:analysis_server/src/services/refactoring/rename_constructor.dart';
 import 'package:analysis_server/src/services/refactoring/rename_import.dart';
+import 'package:analysis_server/src/services/refactoring/rename_label.dart';
 import 'package:analysis_server/src/services/refactoring/rename_library.dart';
 import 'package:analysis_server/src/services/refactoring/rename_local.dart';
 import 'package:analysis_server/src/services/refactoring/rename_unit_member.dart';
@@ -321,6 +322,9 @@ abstract class RenameRefactoring implements Refactoring {
     if (element is ImportElement) {
       return new RenameImportRefactoringImpl(searchEngine, element);
     }
+    if (element is LabelElement) {
+      return new RenameLabelRefactoringImpl(searchEngine, element);
+    }
     if (element is LibraryElement) {
       return new RenameLibraryRefactoringImpl(searchEngine, element);
     }