<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">If we have:<div class=""><br class=""></div><div class="">class N: A {}</div><div class=""><br class=""></div><div class="">you can pass an N into C’s test(x:), since N is an A, but not M’s test(x:), since N is not a B. Thus, it’s not a valid conformance.</div><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Saagar Jha</div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On Jan 17, 2018, at 00:04, Roshan via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Hi,<br class=""><br class="">Cross posting from swift-users in case this behaviour isn't part of<br class="">the language and might be interesting to you folks.<br class=""><br class="">Here is some sample code that gives a protocol conformance error in a<br class="">playground:<br class=""><br class="">protocol A {}<br class="">protocol B: A {}<br class=""><br class="">protocol C {<br class=""> func test(x: A)<br class="">}<br class=""><br class="">class M: C {<br class=""> func test(x: B) {}<br class="">}<br class=""><br class="">Is there a reason why the compiler doesn't infer that ((B) -> ())<br class="">matches ((A) -> ()) because of inheritance?<br class=""><br class="">-- <br class="">Warm regards<br class="">Roshan<br class="">_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class="">https://lists.swift.org/mailman/listinfo/swift-evolution<br class=""></div></div></blockquote></div><br class=""></div></body></html>