1-- { dg-do run }
2-- { dg-options "-gnatws" }
3
4with Ada.Unchecked_Conversion;
5
6procedure Unchecked_Convert1 is
7
8  type Byte is mod 2**8;
9
10  type Stream is array (Natural range <>) of Byte;
11
12  type Rec is record
13    I1, I2 : Integer;
14  end record;
15
16  function Do_Sum (R : Rec) return Integer is
17  begin
18    return R.I1 + R.I2;
19  end;
20
21  function Sum (S : Stream) return Integer is
22    subtype Chunk is Stream (1 .. Rec'Size / 8);
23    function To_Chunk is new Ada.Unchecked_Conversion (Chunk, Rec);
24  begin
25    return Do_Sum (To_Chunk (S(S'First ..  S'First + Rec'Size / 8 - 1)));
26  end;
27
28  A : Stream (1..9) := (others => 0);
29  I : Integer;
30
31begin
32  A (9) := 1;
33  I := Sum (A(1..8));
34end;
35