dyrkin

func whenInitial(wt *fsm.FSM) fsm.StateFunction {
	return func(event *fsm.Event) *fsm.NextState {
		transfer, transferOk := event.Message.(*Transfer)
		if transferOk && event.Data == nil {
			transfer.source <- transfer.amount
			return wt.Goto(AwaitFromState).With(
				&WireTransferData{transfer.source, transfer.target, transfer.amount, wt},
			)
		}
		return wt.DefaultHandler()(event)