<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"><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="">In HuonW’s <a href="https://github.com/apple/swift/pull/4814" class="">recent pull request</a> we <a href="https://ci.swift.org/job/swift-PR-osx/3922/" class="">hit an unusual error</a>:<div class=""><br class=""></div><div class=""><div class=""></div><blockquote type="cite" class=""><div class="">2016-10-03 12:34:08.112 swift[56714:13650955] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -length only defined for abstract class. Define -[_TtCs19_NSContiguousString length]!'</div><div class="">*** First throw call stack:</div><div class="">(</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>0 CoreFoundation 0x00007fff9cbe64f2 __exceptionPreprocess + 178</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>1 libobjc.A.dylib 0x00007fff9daaa73c objc_exception_throw + 48</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>2 CoreFoundation 0x00007fff9cc4d4bd +[NSException raise:format:] + 205</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>3 Foundation 0x00007fff943e8dbd NSRequestConcreteImplementation + 229</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>4 Foundation 0x00007fff9442588a -[NSString length] + 19</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>5 CoreFoundation 0x00007fff9cc2b613 CFStringHashNSString + 51</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>6 libswiftCore.dylib 0x0000000114f7ef56 _TTSfq4s___TFSSg9hashValueSi + 118</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>7 libswiftCore.dylib 0x0000000114f3b96b _TTWSSs8HashablesFS_g9hashValueSi + 43</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>8 libswiftCore.dylib 0x0000000114e8f0a2 _TFVs24_NativeDictionaryStorage7_bucketfxSi + 34</div></blockquote><br class=""></div><div class="">We’re not really sure how this could happen, though. _NSContiguousString <a href="https://github.com/apple/swift/blob/master/stdlib/public/core/StringBridge.swift#L221" class="">certainly <i class="">does</i> implement -length</a>, and even though there’s an <a href="https://github.com/apple/swift/pull/5071" class="">outstanding PR</a> to change it to a property that shouldn’t cause this kind of issue. (It’s not marked @objc, but it shouldn’t need to be because <a href="https://github.com/apple/swift/blob/master/stdlib/public/core/StringBridge.swift#L184-L191" class="">the superclass is</a>.)</div><div class=""><br class=""></div><div class="">Anyone know what’s going on here?</div><div class=""><br class=""></div><div class="">Jordan</div></body></html>