pkg/front_end/testcases/regress/duplicate_builder_01.dart

// Copyright (c) 2024, 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.

int foo = 42;

extension type foo(String foo) {
  set foo(double x) { }
}