| // 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 |