dart-lang
diff --git a/‎pkg/front_end/testcases/extension_methods.dart‎
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+// Copyright (c) 2019, 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.
+
+// SharedOptions=--enable-experiment=extension-methods
+
+import 'package:expect/expect.dart';
+
+class C {
+  int get one => 1;
+}
+
+extension E on C {
+  int get two => 2;
+}
+
+main() {
+  C c = C();
+  var result = c.one + c.two;
+  Expect.equals(result, 3);
+}