[swift-evolution] Required Callback

[James Campbell]

It would be handy if a callback could be marked as required with an
optional descriptive message i.e

class BackgroundTask {
 func run(end: @required("You must call end otherwise iOS will penalise
your app for being a bad citizen") () -> Void)
}

That was the developer can comunicate the bad things that can happen if
this callback isn't called such as iOS peanlizing them for not ending a
background task or perhaps memory leaks caused by clean up code unable to
be triggered.

*___________________________________*

*James*

*james at supmenow.com <james at supmenow.com>⎥supmenow.com <http://supmenow.com>*

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