[swift-evolution] Guaranteed closure execution

[Gwendal Roué]

> Hi Gwendal,
> 
> I don’t think that the movement of @noescape affects the approach: I’d suggest that a proposal (e.g. Felix’s) go with:
> 
> 	func f(closure: @noescape(once) () -> ()) { … }
> 
> The semantics are clear: the closure is guaranteed to be called exactly once on all normal and “throw” paths.  Paths that do not return in either of those ways (e.g. a call to abort) do not need to call the closure.
> 
> IMO, this is a small scope proposal that is likely to be accepted.

The pull request is open: https://github.com/apple/swift-evolution/pull/271

Gwendal Roué