<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Like some others on this list I prefer the `where` because it stands out and therefore increases readability by visually separating semantically different clauses.</div><div><br></div><div>-Thorsten </div><div><br>Am 31.05.2016 um 07:10 schrieb Xiaodi Wu <<a href="mailto:xiaodi.wu@gmail.com">xiaodi.wu@gmail.com</a>>:<br><br></div><blockquote type="cite"><div>Of course, an alternative is to eliminate `where` for all uses of `case` as well.<br><div class="gmail_quote"><div dir="ltr">On Mon, May 30, 2016 at 11:55 PM Thorsten Seitz via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
> Am 29.05.2016 um 17:11 schrieb Thorsten Seitz via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>>:<br>
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>> Am 28.05.2016 um 22:35 schrieb Chris Lattner <<a href="mailto:clattner@apple.com" target="_blank">clattner@apple.com</a>>:<br>
>><br>
>><br>
>>> On May 28, 2016, at 12:07 PM, Thorsten Seitz <<a href="mailto:tseitz42@icloud.com" target="_blank">tseitz42@icloud.com</a>> wrote:<br>
>>><br>
>>> What about requiring `let` before each binding and `case` before each pattern?<br>
>>><br>
>>> guard case let x = a, case let y = b, let z = c, x == y else { … }<br>
>>><br>
>>> Now `let z = c` can only be a let-binding and not a pattern matching clause.<br>
>><br>
>> Yes, that would be enough to solve the ambiguity. The problem with that is that it eliminates a commonality with var/let declarations, which can declare multiple variables.<br>
><br>
> var/let declarations are sufficiently different from let-bindings IMO that this commonality could be dropped.<br>
<br>
In addition the proposal would result in eliminating a commonality of `case` clauses allowing a `where` clause everywhere except in conditional clauses which is worse.<br>
I'd much rather prefer to drop the commonality with var/let declarations!<br>
<br>
-Thorsten<br>
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