fn pmark

@error data Rejected { why: str }

fn moderate(n: i32) -> i32 | Rejected {
  if n % 2 == 1 { fail Rejected{ why: "odd" } }
  n
}

pipeline photo(n: i32) -> i32 {
  respond it
  -> moderate
  -> moderate
}

fn main() io, net, time, db {
  match photo(2) {
    i32 v => print("answer {v}")
    NetError e => print("net error")
  }
  sleep(100ms)
}

answer 2