Ok, I thought it was part of SE-0142 (which has status "implemented (Swift 4)". /Jens
On Wed, Jun 7, 2017 at 9:39 AM, Slava Pestov <spes...@apple.com> wrote: > This is a rather complex feature that is not actually implemented in Swift > 4 (or Swift 3 for that matter). Work is underway to support this, though. > The fact that the second example does not produce a diagnostic is a bug > (probably you will not be able to define a type that conforms to P2 anyway). > > The proposal is here if you’d like to read more about it: > https://github.com/apple/swift-evolution/blob/master/ > proposals/0157-recursive-protocol-constraints.md > > Slava > > > On Jun 6, 2017, at 10:37 PM, Jens Persson via swift-users < > swift-users@swift.org> wrote: > > > > In Swift 4: > > > > protocol P1 { > > associatedtype A: P1 // Error: Type may not reference itself as a > requirement > > } > > protocol P2 { > > associatedtype A where A: P2 // OK > > } > > > > What is the rationale behind this? > > > > /Jens > > _______________________________________________ > > swift-users mailing list > > swift-users@swift.org > > https://lists.swift.org/mailman/listinfo/swift-users > >
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