[swift-evolution] Synthesizing Equatable, Hashable, and Comparable for tuple types

[Xiaodi Wu]

On Fri, Nov 24, 2017 at 9:08 PM, Mike Kluev via swift-evolution <
swift-evolution at swift.org> wrote:

> On 24 November 2017 at 23:47, Douglas Gregor <dgregor at apple.com> wrote:
>
>>
>> e.g., making all tuples of Equatable elements Equatable
>>
>>
> that's already the case.. (all tuples of equatable elements are
> equatable). no?
>

No, tuples do not conform to any protocols. There are hardcoded
implementations of `==` up to some arity in the stdlib to partially
mitigate the lack of protocol conformance.
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