gcc/testsuite/gnat.dg/unchecked_convert8.adb

   1 -- { dg-do compile }
   2 -- { dg-options "-g -O" }
   3
   4 with Ada.Unchecked_Conversion;
   5
   6 package body Unchecked_Convert8 is
   7
   8    type T1 is range 0 .. 255;
   9
  10    type T2 is
  11       record
  12          A : T1;
  13          B : T1;
  14       end record;
  15
  16    for T2 use
  17       record
  18          A at 0 range 0 .. 7;
  19          B at 1 range 0 .. 7;
  20       end record;
  21
  22    for T2'Size use 16;
  23
  24    type T3 is range 0 .. (2**16 - 1);
  25    for  T3'Size use 16;
  26
  27    function T2_TO_T3 is
  28       new Ada.Unchecked_Conversion (Source => T2, Target => T3);
  29
  30    C : constant T3 := T2_TO_T3 (S => (A => 0, B => 0));
  31
  32    procedure Dummy is begin null; end;
  33
  34 end Unchecked_Convert8;