[swift-users] Covariance in protocol adoption

[Joe Groff]

> On Feb 16, 2016, at 11:47 AM, Diego Sánchez via swift-users <swift-users at swift.org> wrote:
> 
> Is this a known limitation/bug? Any plans to improve this?
> 
Yeah, this is a known limitation we'd like to address some day.

-Joe
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