gnu / gcc / a8404c07e7fca388c02c39077865f7d5fa928430 / . / gcc / testsuite / gnat.dg / delta_aggr.adb

-- { dg-do compile } | |

-- { dg-options "-gnat2020" } | |

procedure Delta_Aggr is | |

type T1 is tagged record | |

F1, F2, F3 : Integer := 0; | |

end record; | |

function Make (X : Integer) return T1 is | |

begin | |

return (10, 20, 30); | |

end Make; | |

package Pkg is | |

type T2 is new T1 with private; | |

X, Y : constant T2; | |

function Make (X : Integer) return T2; | |

private | |

type T2 is new T1 with | |

record | |

F4 : Integer := 0; | |

end record; | |

X : constant T2 := (0, 0, 0, 0); | |

Y : constant T2 := (1, 2, 0, 0); | |

end Pkg; | |

package body Pkg is | |

function Make (X : Integer) return T2 is | |

begin | |

return (X, X ** 2, X ** 3, X ** 4); | |

end Make; | |

end Pkg; | |

use Pkg; | |

Z : T2 := (Y with delta F1 => 111); | |

-- a legal delta aggregate whose type is a private extension | |

pragma Assert (Y = (X with delta F1 => 1, F2 => 2)); | |

pragma assert (Y.F2 = X.F1); | |

begin | |

Z := (X with delta F1 => 1); | |

-- The base of the delta aggregate can be overloaded, in which case | |

-- the candidate interpretations for the aggregate are those of the | |

-- base, to be resolved from context. | |

Z := (Make (2) with delta F1 => 1); | |

null; | |

end Delta_Aggr; |