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<p dir="auto">Subscripts, by the way, would not help here, since they cannot throw. <code style="background-color:#F7F7F7; border-radius:3px; margin:0; padding:0 0.4em" bgcolor="#F7F7F7">decode</code> must be able to throw.<br>
<a href="https://bugs.swift.org/browse/SR-238?jql=text%20%7E%20%22subscript%20throw%22" style="color:#3983C4">SR-238</a>; for Apple folks, 28775436.</p>
<p dir="auto">On 16 Mar 2017, at 11:46, Matthew Johnson via swift-evolution wrote:</p>
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<blockquote style="border-left:2px solid #777; color:#777; margin:0 0 5px; padding-left:5px"><div id="5E490381-6C14-4BC1-91C2-6E06CCF0642F"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Mar 16, 2017, at 1:34 PM, Zach Waldowski 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="">
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<div class=""><div style="font-family:Arial;" class="">On Thu, Mar 16, 2017, at 02:23 PM, Matthew Johnson via swift-evolution wrote:<br class=""></div>
<blockquote type="cite" class=""><div style="font-family:Arial;" class="">I don’t have an example but I don’t see a problem either. There are two options for specifying the return type manually. We can use the signature you used above and use `as` to specify the expected type:<br class=""></div>
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<div class="">let i = decode(.myKey) as Int<br class=""></div>
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<div style="font-family:Arial;" class="">The awkwardness of this syntax is exactly what I'm referring to. Would a beginner know to use "as Int" or ": Int"? Why would they? The "prettiness" of the simple case doesn't make up for how difficult it is to understand and fix its failure cases.<br class=""></div>
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<div style="font-family:Arial;" class="">Any official Swift or Foundation API shouldn't, or shouldn't need to, make use of "tricky" syntax.<br class=""></div></div></div></blockquote><div><br class=""></div><div>I don’t think this is especially tricky. Nevertheless, we can avoid requiring this syntax by moving the type argument to the end and providing a default. But I think return type inference is worth supporting. It has become widely adopted by the community already in this use case.</div><br class=""><blockquote type="cite" class=""><div class=""><div class="">
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<blockquote type="cite" class=""><div class=""><div class="">If we don’t support this in Foundation we will continue to see 3rd party libraries that do this.<br class=""></div>
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<div style="font-family:Arial;" class="">The proposal's been out for less than 24 hours, is it really productive to already be taking our ball and go home over such a minor thing?<br class=""></div></div></div></blockquote><div><br class=""></div><div>I don’t think that’s what I’m doing at all. This is a fantastic proposal. I’m still working through it and writing up my more detailed thoughts.</div><div><br class=""></div><div>That said, as with many (most?) first drafts, there is room for improvement. I think it’s worth pointing out the syntax that many of us would like to use for decoding and at least considering including it in the proposal. If the answer is that it’s trivial for those who want to use subscripts to write the wrappers for return type inference and / or subscripts themselves that’s ok. But it’s a fair topic for discussion and should at least be addressed as an alternative that was rejected for a specific reason.</div><br class=""><blockquote type="cite" class=""><div class=""><div class="">
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<div style="font-family:Arial;" class=""><div style="font-family:Arial;" class=""><span class="font" style="font-family:arial, sans-serif, sans-serif">Zach Waldowski</span><br class=""></div>
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<div id="sig40804545" class=""><div class="signature"><a href="mailto:zach@waldowski.me" class=""><span class="font" style="font-family:arial, sans-serif, sans-serif">zach@waldowski.me</span></a><br class=""></div>
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