[swift-evolution] Add AnyHashable to the standard library

[Paul Cantrell]

> On Jul 22, 2016, at 6:15 PM, Erica Sadun via swift-evolution <swift-evolution at swift.org> wrote:
> 
> On Jul 22, 2016, at 4:34 PM, Dmitri Gribenko via swift-evolution <swift-evolution at swift.org> wrote:
>> 
>> You can view the full proposal here:
>> https://github.com/apple/swift-evolution/pull/458/files
>> 
>> Dmitri
> 
> The proposal looks solid. I would be in favor.

The proposal mostly just makes me long for robust existentials. Sigh.

But yes, given the limitations of Swift 3, this does seem useful.

P