gcc/testsuite/gnat.dg/boolean_subtype.adb

   1 -- { dg-do compile }
   2 -- { dg-options "-O2" }
   3
   4 procedure boolean_subtype is
   5
   6    subtype Component_T is Boolean;
   7
   8    function Condition return Boolean is
   9    begin
  10       return True;
  11    end;
  12
  13    V : Integer := 0;
  14
  15    function Component_Value return Integer is
  16    begin
  17       V := V + 1;
  18       return V;
  19    end;
  20
  21    Most_Significant  : Component_T := False;
  22    Least_Significant : Component_T := True;
  23
  24 begin
  25
  26    if Condition then
  27       Most_Significant := True;
  28    end if;
  29
  30    if Condition then
  31       Least_Significant := Component_T'Val (Component_Value);
  32    end if;
  33
  34    if Least_Significant < Most_Significant then
  35       Least_Significant := Most_Significant;
  36    end if;
  37
  38    if Least_Significant /= True then
  39       raise Program_Error;
  40    end if;
  41
  42 end;