Ideas for my own language

Channels

timerChan = chanel(out=chanx:Date)

await def:
    time.Sleep(10)
    timerChan |> time.Now() # send time on timerChan

#Do something else; when ready, receive.
#Receive will block until timerChan delivers.
#Value sent is other goroutine's completion time.
completedAt <| timerChan

for True:
    if v <? ch1:
        print("channel 1 sends", v)
    elif v <? ch2:
        print("channel 1 sends", v)
    else:
        print("neither channel was ready")


def save:Bool | Err
    if not(self.valid):
        @error('Invalid')

    return True

saved | err = save()