pkg/front_end/testcases/extension_types/issue52595.dart - sdk - Git at Google

 // Copyright (c) 2023, 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.

 extension type const V<T>(int id) {}

 const c = const V<int>(0);
	// Copyright (c) 2023, 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.

	extension type const V<T>(int id) {}

	const c = const V<int>(0);