[swift-evolution] [Proposal] Make optional protocol methods first class citizens

[Chris Lattner]

> On Apr 3, 2016, at 10:40 AM, Andrey Tarantsov <andrey at tarantsov.com> wrote:
> 
>> Protocol requirements with default (no-op) implementations already satisfy that design goal, no?
> 
> Chris, as we've discussed in a thread that I think got forked from this one:
> 
> Yes, they do technically, but it would be nice to both:
> 
> 1) make it an obvious documented part of the signature, possibly including the default return value
> 
> 2) possibly make it less verbose by getting rid of the explicitly spelled out protocol extension

Right, but “more is worse” when it comes to language design.  Having a "more general" facility that greatly overlaps with a “more narrow” facility always makes us question whether it is worth the complexity to have both.

-Chris

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