program main
  fn random_i32() -> i32
    call std.random.i32 : i32
  fn random_is_non_negative() -> bool
    if : bool
      binary < : bool
        call random_i32 : i32
        int 0 : i32
      bool false : bool
      bool true : bool
  fn main() -> i32
    call std.io.print_bool : unit
      call random_is_non_negative : bool
    int 0 : i32
  test "random i32 is non-negative"
    call random_is_non_negative : bool