fn panic

fn pick(i: usize) -> str {
  if i > 1 { panic("no such item") }
  ["a", "b"][i]
}

fn main() io {
  let r = scope {
    spawn pick(5)
    ()
  }
  match r {
    Panicked p => print("panic: {p.msg}")
    _ => print("fine")
  }
}

panic: no such item