[swift-evolution] [Accepted] SE-0111: Remove type system significance of function argument labels

[Cao Jiannan]

If you like, you can try to modify your code as you writes. It is crazy.

> 在 2016年7月10日，00:08，Austin Zheng via swift-evolution <swift-evolution at swift.org> 写道：
> 
>> 
>> On Jul 9, 2016, at 1:56 AM, Goffredo Marocchi via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> 
>> Sent from my iPhone
>> 
>> On 9 Jul 2016, at 00:53, Jon Shier <jon at jonshier.com <mailto:jon at jonshier.com>> wrote:
>> 
>>> While I can see why removing the labels from the type system would be a good idea, I don’t see why calling the functions with labels would be actively prohibited. That’s useful information for the developer to have, and if the compiler doesn’t know them in some way, you can be assured Xcode’s autocomplete won’t see them. 
>> 
>> I wish the core team or the author of the proposal came to this thread and engaged again with the community. 
> 
> I'm not inclined to spend time engaging with people who couldn't be bothered to give feedback during the week-long official review period.
> 
>> 
>> I imagine scenarios of callbacks, say for an image downloader or something that ought to happen asynchronously, injected in a method, stored, and then used when the asynchronous operation completed one way or the other. 
>> How does this promote local reasoning so much stressed by Apple itself at WWDC when you have to jump through several hoops to have any idea what the callbacks does or what parameters and in which order it needs them?
> 
> If you really want to promote local reasoning, write short methods and look at the function signature, where you can stick labels. Or use the type system or typealiases.
> 
> A better solution might be the compound function names that came up during both the review thread and this thread (e.g. let foo(with:for:) : (Int, Int) -> Bool = blah). Those were going to be added to the original proposal during private review, but were nixed. If someone feels strongly enough about the issue, they should submit a PR for a proposal amendment or a follow-up proposal.
> 
>> 
>> The benefits to the compiler should be weighed against the negative effects to every day's code and the bugs this may introduce in a safe by default promise language like Swift.
>> 
>>>> On Jul 8, 2016, at 6:35 AM, Goffredo Marocchi via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>>> 
>>>> I still say that this is the case where we do take a stand and do ask for this proposal to be blocked and re-analised, I cannot believe that we are going to be addingthis kind of incosistency to the language and take readability/ease of local reasoning (which Apple stressed at the last WWDC once again) away. The community and the core team just finished bikeshedding a huge change to how API's are imported and how labels are used and how important they are and then we do this?
>>>> 
>>>> On Fri, Jul 8, 2016 at 10:22 AM, Tino Heth via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>>> 
>>>>> Aw. It's really bad that labels are gone for closures at the call site 😢. IMHO, the same principles that encourage the use of labels for "normal" function calls should prevail here. 
>>>> No need to feel bad — if I wasn't ignored (it's hard to notice if this happens ;-), the argument has been considered.
>>>> 
>>>> Additionally, those labels may return in the future — although there is a astoundingly long list of features that will be removed because their implementation is flawed, and whose fans have been calmed down with the argument that they'll be re-added in an improved form later ;-)
>>>> 
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