> 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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