<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><blockquote type="cite" class="">• Angle brackets already appear in var declarations for generic types; that means there are two different meanings for angle brackets in the same construct.<br class=""></blockquote><div class="">Isn't the same true when you declare an array (or a closure)?</div><br class=""><blockquote type="cite" class="">• When we eventually allow you to apply multiple behaviors to a single property, that will also mean that *commas* are used in both of those angle bracket constructs, but with different meanings (one means "chain these", the other means "fill these two slots").<br class=""></blockquote><div class="">True, but imho also no deal breaker; I would like to have labeled generic parameters anyway ;-)</div><div class="">Afaics, it isn't decided how multiple behaviors will be handled yet.</div><br class=""><blockquote type="cite" class="">These are not fatal errors, but they're also completely unforced—either `[]` or `{}` would not have this problem. So why choose the option that has the problem?<br class=""></blockquote>Because those have a similar (and imho bigger) problems:<div class="">Grouping blocks of code or declaring arrays are things that are tightly coupled with "their" braces, and for me, "<>" causes the smallest disruption… arrays, capture lists and blocks have little in common with behaviors, but property behaviors could be expressed using generics*</div><div class=""><br class=""></div><div class="">Tino</div><div class=""><br class=""></div><div class="">* thinking of something like</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">protocol</span> Behavior {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">typealias</span> ValueType</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">var</span> value: <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">ValueType</span> { <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">get</span> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">set</span> }</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class="">}</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">class</span> DefaultBehavior<T> {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">typealias</span> ValueType = <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">T</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">var</span> value: <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">ValueType</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">init</span>(value: <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">ValueType</span>) {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">self</span>.<span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">value</span> = value</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>}</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class="">}</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">class</span> Sample {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">var</span><DefaultBehavior> content: Int?</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class="">}</div></div><div class=""><br class=""></div><div class="">Here, "var" would create a container whose behavior is determined by a generic parameter; access of "content" would be mapped to that container.</div><div class="">I know behaviors are supposed to work slightly different, but that doesn't destroy the mental model of a parameterized container.</div></body></html>