[swift-evolution] Revisiting SE-0110

[John Holdsworth]

> On 1 Jun 2017, at 17:31, Tommaso Piazza via swift-evolution <swift-evolution at swift.org> wrote:
> 
> >>> On May 28, 2017, at 7:04 PM, John McCall via swift-evolution
> >>> <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> >>> 
> >>> Yes, I agree.  We need to add back tuple destructuring in closure parameter
> >>> lists because this is a serious usability regression.  If we're reluctant to
> >>> just "do the right thing" to handle the ambiguity of (a,b), we should at least
> >>> allow it via unambiguous syntax like ((a,b)).  I do think that we should just
> >>> "do the right thing", however, with my biggest concern being whether there's
> >>> any reasonable way to achieve that in 4.0.

+1 This seems to be the nub of the solution. It would still be a source compatibility breaking change
but only double bracketed syntax can satisfy the anti-ambiguists and the single-line-expressivists
and could apply to tuples in general. The current state requiring an intermediate variable is terrible.

-John

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