gcc/testsuite/gnat.dg/object_overflow2.adb

-- { dg-do compile }

with Interfaces.C; use Interfaces.C;

procedure Object_Overflow2 is

  procedure Proc (x : Boolean) is begin null; end;

  type Arr is array(0 .. ptrdiff_t'Last) of Boolean;
  Obj : Arr; -- { dg-warning "Storage_Error" }

begin
  Obj(1) := True;
  Proc (Obj(1));
end;