Seems like a no-brainer to me. If there has been any argument against making this change I am really curious to know what it is. I’m super excited that this might make it into 4.1. Woohoo!!!
> On Nov 22, 2017, at 12:51 AM, Douglas Gregor via swift-evolution > <swift-evolution@swift.org> wrote: > > Hi all, > > We’re having a bit of a debate <https://github.com/apple/swift/pull/12910> > over the question of whether SE-0143 “Conditional Conformances” > <https://github.com/apple/swift-evolution/blob/master/proposals/0143-conditional-conformances.md> > actually proposes any standard library changes at all, or whether they > should all be brought up separately. So, I’ll pitch the pieces that I’d love > to put into 4.1 to see if they’re as obvious as I think they should be :) > > Proposal: make Optional, Array, ArraySlice, ContiguousArray, and Dictionary > conform to Equatable when their type parameters are Equatable (and Set always > conform to Equatable). Specifically, add to the standard library: > > extension Optional: Equatable where Wrapped: Equatable { /*== already > exists */ } > extension Array: Equatable where Element: Equatable { /*== already > exists */ } > extension ArraySlice: Equatable where Element: Equatable { /*== already > exists */ } > extension ContiguousArray: Equatable where Element: Equatable { /*== > already exists */ } > extension Dictionary: Equatable where Value: Equatable { /*== already > exists */ } > extension Set: Equatable { /*== already exists */ } > > Motivation: we need these for ==/!= to properly compose. It’s a > highly-requested feature and an obvious “first use” of conditional > conformances for the standard library that is unlikely to break any code. > > Implementation: https://github.com/apple/swift/pull/13046 > <https://github.com/apple/swift/pull/13046> > > Thoughts? > > > - Doug > > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution
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