<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=""><div><blockquote type="cite" class=""><div class="">On Feb 19, 2016, at 2:30 PM, plx via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class="highlight highlight-source-swift" style="box-sizing: border-box; margin-bottom: 16px; color: rgb(51, 51, 51); font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);"><pre style="box-sizing: border-box; overflow: auto; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 14px; margin-top: 0px; margin-bottom: 0px; line-height: 1.45; padding: 16px; background-color: rgb(247, 247, 247); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; word-wrap: normal; word-break: normal;" class="">networkRequest<span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">.</span>fetchData() { [<span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">weak</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">self</span>] result <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">in</span>
<span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">guard</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">self</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">!=</span> <span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">nil</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">else</span> { <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">return</span> }
<span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">let</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">self</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">=</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">self</span><span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">!</span>
</pre></div></div></div></div></blockquote><div class="">…isn’t there a race condition in this example (admittedly an *unlikely* one in most settings, but still…)?</div></div></div></div></blockquote></div><br class=""><div class="">Yes, that's a good point.</div><div class=""><br class=""></div><div class="">Now that I think about it, allowing a standalone `let self =` could never be implemented in a way *guaranteed* to avoid a race condition, so perhaps I should remove it from the proposal altogether.</div><div class=""><br class=""></div><div class="">When I incorporate the next round of feedback, I'll rework the proposal to indicate that it can only be used with `if let` or `guard let`.</div><div class=""><br class=""></div></body></html>