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

Xiaodi Wu xiaodi.wu at gmail.com
Sun May 29 09:15:15 CDT 2016

Haravikk, this *is* the proposal for removing where clauses; changing the
rules about commas was the later addition to the discussion.

On Sun, May 29, 2016 at 06:55 Haravikk via swift-evolution <
swift-evolution at swift.org> wrote:

> On 28 May 2016, at 23:48, Chris Lattner via swift-evolution <
> swift-evolution at swift.org> wrote:
> On May 27, 2016, at 12:11 PM, Joe Groff <jgroff at apple.com> wrote:
> Hello Swift community,
> The review of SE-0099 “Restructuring Condition Clauses” begins now and
> runs through June 3, 2016. The proposal is available here:
> https://github.com/apple/swift-evolution/blob/master/proposals/0099-conditionclauses.md
> Thanks everyone.  FYI, Erica and I discussed it offlist and agreed to
> amend the proposal: now you can use semicolons or a newline to separate
> clauses of different types.
> While I like the improvements made to the proposal, I’m still not in
> favour of removing the where clause; the introduction of semi-colons and
> new-lines as separators eliminates the need to use it if you don’t want to,
> so developers will be free to drop it if they wish, but I don’t see any
> real reason to remove it from the syntax, as it feels inconsistent if I can
> use it elsewhere, and I prefer to do so, particularly on if/guard.
> I get that there’s some inconsistency between the use of where on while
> and for loops, but actually the behaviour on while loops can be desirable,
> and I feel the ambiguity could be addressed in other ways. I feel like
> removing or changing the where clause should be its own issue, and this one
> should be focused on removing the ambiguity caused by the use of commas, as
> anyone that wants semi-colons but also likes to use where is forced to
> oppose the whole proposal as they’re not mutually exclusive.
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