[swift-evolution] [swift-evolution-announce] [Review] SE-0099: Restructuring Condition Clauses

[Thorsten Seitz]

> Am 29.05.2016 um 17:11 schrieb Thorsten Seitz via swift-evolution <swift-evolution at swift.org>:
> 
> 
>> Am 28.05.2016 um 22:35 schrieb Chris Lattner <clattner at apple.com>:
>> 
>> 
>>> On May 28, 2016, at 12:07 PM, Thorsten Seitz <tseitz42 at icloud.com> wrote:
>>> 
>>> What about requiring `let` before each binding and `case` before each pattern?
>>> 
>>> guard case let x = a, case let y = b, let z = c, x == y else { … }
>>> 
>>> Now `let z = c` can only be a let-binding and not a pattern matching clause.
>> 
>> 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.
> 
> var/let declarations are sufficiently different from let-bindings IMO that this commonality could be dropped.

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.
I'd much rather prefer to drop the commonality with var/let declarations!

-Thorsten