[swift-evolution] guard let x = x

[Pyry Jahkola]

> On 31 Oct 2016, Xiaodi Wu wrote:
> 
> Don't we currently have "for x in y" and "for var x in y"? So, we could have "unwrap x" and "unwrap var x".
> 
> And since unwrap wouldn't allow arbitrary Boolean expressions at the front like if and guard statements do, it could use the where clause like for loops do.

You're right. I'd forgotten about that. I found out you can even place the `var` keyword inside a tuple pattern where only one variable is going to be modified locally:

    for (var i, c) in "foobar".characters.enumerated() {
      i += 1      // pretty contrived example
      print(i, c)
    }

— Pyry

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