1-- { dg-do run }
2-- { dg-options "-gnatws" }
3
4procedure View_Conversion1 is
5
6   type Matrix is array (Integer range <>, Integer range <>) of Float;
7
8   S1 : Matrix (-3 .. -2, 2 .. 3) := ((2.0, -1.0), (-1.0, 2.0));
9   S2 : Matrix (1 .. 2, 1 .. 2) := S1;
10   S3 : Matrix (2 .. 3, -3 .. -2);
11   S4 : Matrix (1 .. 2, 1 .. 2);
12
13   function Normal_Last (A : Matrix; N : Natural) return Boolean is
14   begin
15      if A'Last (1) = N and then A'Last (2) = N then
16         return True;
17      else
18         return False;
19      end if;
20   end;
21
22   procedure Transpose (A : Matrix; B : out Matrix) is
23      N : constant Natural := A'Length (1);
24      subtype Normal_Matrix is Matrix (1 .. N, 1 .. N);
25   begin
26      if not Normal_Last (A, N) or else not Normal_Last (B, N) then
27         Transpose (Normal_Matrix (A), Normal_Matrix (B));
28         return;
29      end if;
30
31      for J in 1 .. N loop
32         for K in 1 .. N loop
33            B (J, K) := A (K, J);
34         end loop;
35      end loop;
36   end;
37
38begin
39   Transpose (S1, S3);
40   Transpose (S3, S4);
41
42   if S4 /= S2 then
43      raise Program_Error;
44   end if;
45end;
46