~repos /plum

module std

enum Result =
  | Ok(a)
  | Err(b)

  isOk() -> Bool =
    doc: "Checks whether the result is an `Ok` value"
    if Ok(_) == this
      True
    else if Err(_) = this
      False
    check:
      Ok("data").isOk() == True
      Err("no data").isOk() == False