[swift-evolution] [Pitch] Introducing role keywords to reduce hard-to-find bugs

[Haravikk]

> On 14 Jun 2017, at 19:08, Xiaodi Wu via swift-evolution <swift-evolution at swift.org> wrote:
> 
> On Wed, Jun 14, 2017 at 1:01 PM, David Hart via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> Sorry, initially sent off-list:
> 
> I think this proposal is a great idea. But I would vote for the alternative of only having default and implicitly deducing extend when default is not specified:
> 
> This wouldn't work with the fundamental design decision that these are optional keywords, which IMO is absolutely key.

Hmm, I'm inclined to agree with David that only the default keyword really seems like it's necessary, and that extend can be implied.

My preference would be to just add the default keyword, and have breaches treated as warnings using the current behaviour, which we can eliminate and elevate to an error in future once people have had a chance to change their code.
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