A Ping/Pong Example

import Prelude
go :: Process ()
go = do
  self <- getSelf
  pid <- spawn loop
  pid ! (self, :ping)
  receive
    :pong -> println "Pong!"
  pid ! :stop
loop :: Process ()
loop =
  receive
    (from, :ping) -> do
      println "Ping!"
      from ! :pong
      loop
    :stop -> return ()