[swift-evolution] [Review] SE-0084: Allow trailing commas in parameter lists and tuples

[Joe Groff]

> On May 13, 2016, at 7:04 AM, Erica Sadun <erica at ericasadun.com> wrote:
> 
> On May 12, 2016, at 11:01 PM, Chris Lattner via swift-evolution <swift-evolution at swift.org> wrote:
>> On May 12, 2016, at 4:50 PM, Joe Groff <jgroff at apple.com> wrote:
>>>> You’re arguing that you want to read Swift code written like this?
>>> 
>>> I wouldn't mind it.
>> 
>> I personally find that style repulsive :-) and I haven’t seen swift code commonly doing it.  I’m not sure that we want to encourage it either.
>> 
> 
> No. Tell us what you *really* think of the style. Don't hold back.[1]
> 
>> If we were really concerned about this, a narrower way to solve the same problem would be to allow a comma before the ), but *only* when there is a newline between them.  I still don’t see why we’d want to encourage this though.
> 
> I wouldn't object to this restriction. I cannot think of a situation where using ",)" -- that is the comma adjacent to a closing parenthesis -- makes sense for any reason previously enumerated in support of this proposal.

I don't see why we need to micromanage the situations where trailing commas are allowed. That's just unnecessarily increasing the fractal complexity of the language. We've delegated other style choices like requiring `self.` or brace formatting to linters; why does this one need to be legislated by the compiler?

-Joe