pkg/front_end/testcases/general/extension_annotation.dart - sdk - Git at Google

 // Copyright (c) 2021, 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.

 class A {
   const A();
 }

 @A()
 extension Extension on int {}

 main() {}
	// Copyright (c) 2021, 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.

	class A {
	const A();
	}

	@A()
	extension Extension on int {}

	main() {}