# [swift-evolution] [Proposal][Discussion] Deprecate Tuple Shuffles

Mon May 8 03:24:11 CDT 2017

```I still have to disagree on that. Tuple patterns are not consistent in Swift.

Here is a small proof of my claim:

enum Foo {

case a(b: Int)
}

switch Foo.a(b: 10) {

case .a(b: let x):
print(x)
}

let tuple = (x: 2, y:  20)

switch tuple {

case (x: let a, y: let b):
print(a); print(b)
}

(x: let a, y: let b): (x: Int, y: Int) = tuple // Error!!!
Tuple destructuring only works using the shorthand pattern, which _can_ lead to all those puzzles from the discussion.

The shorthand form ‘Is good and beautiful’ (German proverb), but it can do more harm than it should. Personally I would entirely ban the shorthand version unless we’ve got a superior version of it without all these issues.

By the way not only tuples are affected by the mentioned puzzle:

enum Foo {

case sum(x: Int, y: Int)
}

switch Foo.sum(x: 3, y: 1) {

case let .sum(x: Int, y: Double):
print(Int + Double) // prints 4
}

--