[swift-evolution] What are the rules for including @ with attributes/keywords and the possibility of removing it

[Joe Groff]

> On Jan 11, 2016, at 9:49 AM, Brandon Knope via swift-evolution <swift-evolution at swift.org> wrote:
> 
> @noescape
> @autoclosure
> 
> Is there a particular reason why there is a @ prepending these attributes/keywords?
> 
> 
> func test(@autoclosure test: () -> Bool) -> Void
> 
> vs.
> 
> func test(autoclosure test: () -> Bool) -> Void 
> 
> It seems cleaner/clearer without @ sprinkled everywhere, but what is the rationale behind needing the @ symbol?

Without the '@', you're declaring a parameter labeled 'autoclosure'.

-Joe

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