> On Jun 14, 2017, at 10:11 AM, Erica Sadun via swift-evolution > <swift-evolution@swift.org> wrote: > > Some pals and I have been kicking an idea around about introducing better > ways to support the compiler in protocol extensions. We want to eliminate > some hard-to-detect bugs. We've been brainstorming on how to do this without > affecting backward compatibility and introducing a minimal impact on > keywords. > > We'd love to know what you think of our idea, which is to introduce "role" > keywords. Roles allow the compiler to automatically check the intended use of > a extension member definition against its protocol declarations, and emit > errors, warnings, and fixits as needed. We think it's a pretty > straightforward approach that, if adopted, eliminates an entire category of > bugs. > > The draft proposal is here: > https://gist.github.com/erica/14283fe18254489c1498a7069b7760c4 > <https://gist.github.com/erica/14283fe18254489c1498a7069b7760c4> > > Thanks in advance for your thoughtful feedback,
+1 on the idea of this. The same sort of thing is extremely valuable classes that are trying to implement "optional requirements” in @objc protocols. -Chris
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