gcc/testsuite/gnat.dg/hyper_flat.adb

   1 -- { dg-do run }
   2 -- { dg-options "-gnatp" }
   3
   4 procedure Hyper_Flat is
   5
   6    type Unsigned is mod 2 ** 32;
   7    x : Integer := 0;
   8    pragma Volatile (X);
   9
  10    S : constant String := (1 .. X - 3 => 'A');
  11    --  Hyper-flat null string
  12
  13 begin
  14    if Unsigned'(S'Length) /= 0 then
  15       raise Program_Error;
  16    end if;
  17 end;