service MyOp("op"):
  identity(s: string) -> string

service Op("op"):
  noop: -> ()

-- peers is of size 2
func gather_values(peers: []string, another_peer: string) -> []string:
  values: *string

  for peer <- peers par:
    on peer:
      Op.noop()
      values <<- "hello"

  on another_peer:
    MyOp.identity(values!1)
  <- values