> On Jun 15, 2017, at 4:55 PM, Xiaodi Wu <xiaodi...@gmail.com> wrote:
>
>>>
>>> Agreed, it may be too late to correct this (certainly we can't outright
>>> remove it in Swift 4 if someone is using it for something important).
>>> However if it turns out that it really isn't used, then warning about it in
>>> 4 and removing it shortly after may be possible.
>>
>> And I think its difficult to make the parallel between the two. SE-0110
>> basically impacted everybody calling higher-order functions on Dictionary (+
>> more users from libraries like RxSwift), which makes an enormous proportion
>> of the Swift community. On the other hand, despite the enormous amount of
>> time I have sinked into learning, discussing and enjoying Swift, I never
>> come upon the tuple element name syntax in patterns until Robert pointed to
>> it out on twitter several weeks ago.
>
> By the way, I’m not attempting to deduce that nobody uses this feature by the
> fact I didn’t know about it. But I think it’s one interesting datapoint when
> comparing it to SE-0110.
>
>
> SE-0110, **in retrospect**, has had impacts on a lot of users; prospectively,
> it was thought to be a minor change, even after review and acceptance.
>
> Keep in mind that this proposed change would also eliminate inline tuple
> shuffle. For instance, the following code will cease to compile:
>
> let x = (a: 1.0, r: 0.5, g: 0.5, b: 0.5)
> func f(color: (r: Double, g: Double, b: Double, a: Double)) {
> print(color)
> }
> f(color: x)
>
> It is an open question how frequently this is used. But like implicit tuple
> destructuring, it currently Just Works(TM) and users may not realize they’re
> making use of the feature until it’s gone.
>
To (re)clarify, I was just talking about removing tuple element names from the
tuple pattern grammar. This example doesn’t use tuple patterns, so it wouldn’t
be affected. I’m not proposing removing tuple shuffles.
-Chris
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