| * 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. |

| * @assertion A null-shorting cascade expression e?..s translates as follows, |

| * where x and y are fresh object level variables. |

| * fn[k : Exp -> Exp] : Exp => |

| * let x = EXP(e) in x == null ? null : let y = EXP(x.s) in k(x) |

| * @description Check that a null-shorting cascade expression e?..s translates |

| * as follows, where x and y are fresh object level variables. |

| * fn[k : Exp -> Exp] : Exp => |

| * let x = EXP(e) in x == null ? null : let y = EXP(x.s) in k(x) |

| * Check that '?..' operator must be the first in the cascade sequence |

| * @author sgrekhov@unipro.ru |

| String test1 = "Let it be"; |

| String test2 = "Show must go on"; |

| // [analyzer] unspecified |

| // [analyzer] unspecified |