beginner array question

[limor_ru@walla.co.il (lolo27)]

hi
i am writing a generic package
generic
   ---------general parameters-----------
   type Someting is(<>);
   type something_array is Array (integer range<>) of Someting ;   

---------------------------------------------------
in the adb file i want to ask the following 
 function is_final(current_state:Someting ;final:something_array ) return boolean is
   begin
      if current_state in final'First..final'Last then
         return true;
      else
         return false;
      end if;  
   end is_final;
   
   ----

how can i ask if current_state is in final

thanks a lot