Hi Haravikk,

Am 2017-08-10 11:07, schrieb Haravikk via swift-evolution:
I don't feel that conforming to
Equatable/Hashable is sufficient as an opt-in. Consider for example
someone who declares their type as Equatable/Hashable, then sets to
work on the details of their type, forgetting to implement the actual
equatable/hashable behaviour they want.


This is no different than a default implementation of the protocol.
In fact, the proposal just adds something like this:

extension Struct<A, B, ...>: Equatable where A: Equatable, B: Equatable, ... { static func ==(lhs: Self, rhs: Self) -> Bool { /* insert implementation here */ }
    }

We don't require/support some special keywords for other protocols with default implementation either,
so I see no reason to add them here.

Your concerns are orthogonal to this proposal and should be discussed independently.

--
Martin
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