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

[Adriano Ferreira]

Hi,

I still would like to better understand that.

Is the reason to use `@` to hint the compiler / optimizer? Why not make `autoclosure`, `noescape`, etc. special keywords as well?

— A

> On Jan 11, 2016, at 1:19 PM, Brandon Knope via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Ok thanks I’ll look into it! It may remove some confusion / unclarity for me
> 
> Brandon 
> 
>> On Jan 11, 2016, at 1:18 PM, Joe Groff <jgroff at apple.com <mailto:jgroff at apple.com>> wrote:
>> 
>> 
>>> On Jan 11, 2016, at 10:17 AM, Brandon Knope <bknope at me.com <mailto:bknope at me.com>> wrote:
>>> 
>>> 
>>>> On Jan 11, 2016, at 1:14 PM, Joe Groff <jgroff at apple.com <mailto:jgroff at apple.com>> wrote:
>>>> 
>>>> 
>>>>> On Jan 11, 2016, at 9:49 AM, Brandon Knope via swift-evolution <swift-evolution at swift.org <mailto: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
>>>> 
>>> 
>>> What about “inout” then?
>>> 
>>> And duh! I completely forgot about parameter labels -_-
>> 
>> 'inout' is a special case, and we've reserved it as a keyword. There's a thread about moving 'inout' to eliminate this special case.
>> 
>> -Joe
> 
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