<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I agree, as long as the typealias and second use of the type name is not necessary.<div class=""><br class=""></div><div class="">Because </div><div class=""><div style="margin: 0px; font-size: 14px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">extension</span> <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">CollectionType</span> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">where</span> Generator.Element == Int {}</div><div class="">compiles…</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 14px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">var</span> collection: <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">CollectionType</span> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">where</span> Generator.Element == Int</div></div><div style="margin: 0px; font-size: 14px; line-height: normal; font-family: Menlo;" class=""><span style="font-family: Helvetica; font-size: 12px;" class="">should also.</span></div></div></body></html>