On Fri, May 5, 2017 at 12:42 AM, Adrian Zubarev via swift-evolution < swift-evolution@swift.org> wrote:
> Okay now I see where this is going. So basically you want to mirror the > behavior of function parameters into tuples. > > You might want to be a little bit more explicit on types in your proposal > to better understand the so called ‘tuple shuffle’. > > let a: (x: Int, y: Int) = (x: 1, y: 2) > var b: (y: Int, x: Int) = a > a.x == b.x > a.y == b.y > > Label swap (tuple shuffle) while destructuring: > > let tuple: (first: Int, second: (x: Int, y: Int)) = (first: 0, second: (x: 1, > y: 2)) > > let (first: a, second: (x: b, y: c)): (first: Int, second: (x: Int, y: Int)) > = tuple // fine, unaffected > > let (second: (x: b, y: c), first: a): (second: (x: Int, y: Int), first: Int) > = tuple // shuffle => error > > No, I thought this was what Robert was proposing, but he is proposing the elimination of all labels in tuple patterns. Your second example would be banned.
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