tests/language/inference/circularity_test.dart

// Copyright (c) 2017, 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.

var /*@compile-error=unspecified*/ x = () => y;
var /*@compile-error=unspecified*/ y = () => x;

void main() {
  x;
  y;
}