def test_string(prog: String, cname: String) = {

  val tks = tokenise(prog)

  //println(tks)

  val ast = Prog.parse_all(tks).head

  //println(ast)

  val code = fun_compile(ast)

  //println(code)

  os.write.over(os.pwd / (cname ++ ".ll"), code)

  //println(eval(ast))

}