<div dir="auto">Replying to swift-users as well, as it's probably the more appropriate forum.</div><div dir="auto"><br></div><div dir="auto">SE-0142 (Permit where clauses to constrain associated types) is what brought about this feature. It is now used in the standard library.</div><div dir="auto"><br></div><div><br><div class="gmail_quote"><div>On Wed, Jul 5, 2017 at 00:26 Jens Persson via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>The following compiles in Swift 4 (but not in Swift 3.1):</div><div><br></div><div><div><div>protocol P1 {</div><div> associatedtype A</div><div>}</div><div>protocol P2 : P1 where A == Int {</div><div>}</div></div></div><div><br></div>I've not been able to find any proposal, discussion or documentation mentioning it so any pointers to such would be greatly appreciated.<div><br></div><div>Also, is this new feature used somewhere in the std lib?</div><div><br></div><div>/Jens</div></div>
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