valsource=message[MessageSource]?:error("Cannot find MessageSource from message")
valsource=message[MessageSource]?:error("Cannot find MessageSource from message")
check(sourceisOnlineMessageSource.Incoming.FromGroup){"source provided to a GroupMessage must be an instance of OnlineMessageSource.Incoming.FromGroup"}
check(sourceisOnlineMessageSource.Incoming.FromGroup){"source provided to a GroupMessage must be an instance of OnlineMessageSource.Incoming.FromGroup"}