[swift-evolution] [Idea] Add blockreturn keyword

[Jacob Bandes-Storch]

Some previous discussion in "Pitch: @autoreleasepool attribute for loops":

http://comments.gmane.org/gmane.comp.lang.swift.evolution/2796

On Wed, Feb 17, 2016 at 3:05 PM, Brent Royal-Gordon via swift-evolution <
swift-evolution at swift.org> wrote:

> > I often get “return blind” when looking at a method with blocks inside
> of it. I don’t know whether a return returns from the method or a block
> within that method. It would be nice to have a totally different keyword
> for blocks so I could distinguish the two.
>
> Without endorsing the idea, I'll suggest the `leave` keyword for this role.
>
> Of course, this also kind of suggests that we ought to support non-local
> returns, which I don't think is realistic.
>
> (Hmm. *Could* we support non-local returns from @noescape closures passed
> to rethrows functions?)
>
> --
> Brent Royal-Gordon
> Architechies
>
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