<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Type-erasure to the rescue? Links back to our twitter discussions Joe.<div class="">David.</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 12 Dec 2015, at 04:53, Joe Groff 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 style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;" class=""><blockquote type="cite" class=""><div class=""><br class="Apple-interchange-newline">On Dec 11, 2015, at 7:48 PM, Drew Crawford <<a href="mailto:drew@sealedabstract.com" class="">drew@sealedabstract.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Dec 11, 2015, at 9:01 PM, Joe Groff <<a href="mailto:jgroff@apple.com" class="">jgroff@apple.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span class="" style="font-family: HelveticaNeue; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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; float: none; display: inline !important;">with its Product type generalized to Any.<span class="Apple-converted-space"> </span></span></div></blockquote></div><br class=""><div class=""><br class=""></div><div class="">In the alternate example</div><div class=""><br class=""></div><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"><div class="">protocol Factory {</div><div class=""> typealias Product: ProductProtocol</div><div class=""> func make() -> Product</div><div class=""> var description : String { get }</div><div class="">}</div></blockquote><br class=""><div class="">would it generalize to ProductProtocol (e.g. not Any)?</div></div></div></blockquote><div class=""><br class=""></div><div class="">Yeah, when generalizing a protocol type, we ought to be able to either generalize the associated types to their upper bounds, for use cases like yours, or constrain them to specific types, for the AnyGenerator<T> kind of case.</div><div class=""><br class=""></div><div class="">-Joe</div></div><img src="https://u2002410.ct.sendgrid.net/wf/open?upn=nE9rxSXA5G4kxsTVkgv43hXwizS3O2z60WweqomIrdhrAB-2BURuPZwCJxfE0dnUi4lG-2FYojkye6tKiRdorTS8hPE71WQ2eFbkuoz2FNgXTtrehv-2BPePQYQrzm1ji4xLF4Q-2BXs3FOaJAHzqpp-2BNVt8vyQP1qdRy8nU6n0IuyNuLuofouHCjDbHRTo4zx2v1dclNzCV-2BmLYkcGkxa65ewuaqkCtxMH0A4z5B9bx-2BQlpzic-3D" alt="" width="1" height="1" border="0" style="font-family: Helvetica; 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