fn foo (val) -> receive {
  (:report) -> {
    print! ("LUDUS SAYS ==> value is {val}")
    foo (val)
  }
  (:set, x) -> {
    print! ("LUDUS SAYS ==> foo! was {val}, now is {x}")
    foo (x)
  }
  (:get, pid) -> {
    print! ("LUDUS SAYS ==> value is {val}")
    send (pid, (:response, val))
    foo (val)
  }
}

let fooer = spawn! (fn () -> foo (42))
print! (fooer)
send (fooer, (:set, 23))
yield! ()
send (fooer, (:get, self ()))
yield! ()

flush! ()