Xcode 8.3 beta 3 is complaining that type doesn't conform to protocol Equatable

[WooD1k]

I'm getting this error:

Type 'MessageInfo' does not conform to protocol 'Equatable'

Here is the code:

struct MessageInfo: EqualsHashable {
    let data: Data
    let hint: String

    static let hashes: Hashes<MessageInfo> = Hashes()
        .append(hashable: { $0.data })
        .append(hashable: { $0.hint })
}

Proposed solution by Xcode:

Equals.EqualsEquatable:3:20: Protocol requires nested type 'Equals'; do you want to add it?

Equals version - 2.0.0

Any thoughts, ideas?

Thanks in advance!

[tomquist]

This seems to work in Xcode 8.2.1 and according to this any Swift code compatible to Swift 3.0 should also compile in 3.1. I'm downloading the latest beta right now and will look into this in detail.

[WooD1k]

@tomquist thanks a bunch!
Yes, everything is okay in Xcode 8.2.1

[WooD1k]

EqualsXcode8_3.zip
@tomquist here is the sample project

[tomquist]

Adding this line to your struct resolves the issue.
typealias Equals = Hashes<MessageInfo>

However I think this is a bug in Swift 3.1. I'll open a Swift bug and link this here.

[WooD1k]

@tomquist after adding a typealias i've seen - Cannot specialize non-generic type 'MessageInfo.Hashes' (aka 'Hashes<MessageInfo>') but i can't reproduce it in sample project

[tomquist]

Try typealias Equals = Equals.Hashes<MessageInfo>

[tomquist]

Oh just tried it but this won't work either because the compiler uses the wrong anchor type to resolve Hashes.
However, this should work (which is a bit ugly):

typealias MessageInfoHashes = Hashes<MessageInfo>
struct MessageInfo: EqualsHashable {
    typealias Equals = MessageInfoHashes
    let data: Data
    let hint: String

    static let hashes: Hashes<MessageInfo> = Hashes()
        .append(hashable: { $0.data })
        .append(hashable: { $0.hint })
}

[tomquist]

I created this Swift Jira issue: https://bugs.swift.org/browse/SR-4143

[tomquist]

Has been fixed in the Swift compiler. Thanks for reporting this issue. I will test this again once the next snapshot is available.

[WooD1k]

@tomquist many thanks for your help and fast feedback!

[tomquist]

Fixed in Xcode 8.2 beta 4