m8s

    fn outer() -> Result(success, failure) {
      result.map(parse_id(), fn(id) {
        ... // More code that uses the id
      })
    }

    fn outer() -> Result(success, failure) {
      use id <- result.map(parse_id())
      ... // More code that uses the id
    }

    pub fn require_form(
      request: Request(Connection),
      next: fn(FormData) -> Response(Body),
    ) -> Response(Body)

    use form <- wisp.require_form(req)