<div dir="auto"><p dir="ltr">This definitely looks like a bug. Maybe some of the amber folks are busy with Valhalla or something, but I can't see this NOT being a bug.</p><p dir="ltr"><span class="gmail_chip gmail_plusreply" dir="auto"><a href="mailto:angelos.bimpoudis@oracle.com" style="color:#15c;text-decoration:underline" target="_blank" rel="noreferrer">@Angelos Bimpoudis</a></span><span> poke poke poke</span></p></div>
<br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jun 7, 2025, 3:14 AM Jean-Noël Rouvignac <<a href="mailto:jean-noel.rouvignac@pingidentity.com" rel="noreferrer noreferrer" target="_blank">jean-noel.rouvignac@pingidentity.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hello folks,</div><div><br></div><div>JDK 25 rampdown phase 1 is now behind us, congrats and thanks for all the work done to get there!<div><br></div>I am reviving this use case to see if anyone agrees that this may be a bug?<br><br></div><div>Thank you,</div><div>Jean-Noel</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 16, 2025 at 11:37 AM Jean-Noël Rouvignac <<a href="mailto:jean-noel.rouvignac@pingidentity.com" rel="noreferrer noreferrer noreferrer" target="_blank">jean-noel.rouvignac@pingidentity.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div><div><div>Hello amber-dev folks!<br><br></div><div>While using pattern matching for instanceof I noticed a small incoherent oddity.<br></div><div><br></div><div>Take this code:</div><div>```<br>static void ensureCapacity(List l) {<br> if (l instanceof LinkedList) {<br> throw new IllegalArgumentException("Use an efficient list implementation");<br> } else if (!(l instanceof ArrayList al)) {<br> return;<br> }<br> al.ensureCapacity(10);<br> System.out.println("done");<br>}<br><br>ensureCapacity(new ArrayList());</div>```<br><br>The compiler rejects this code with: `Cannot resolve symbol 'al'`.<br>(I have tested that code with JDK 24 in the playground (<a href="https://dev.java/playground" rel="noreferrer noreferrer noreferrer" target="_blank">https://dev.java/playground</a>) but also in my IDE with JDK 21)<br><br></div>However #1, removing the `else` keyword makes the code successfully compile:<br>```<br> }</div><div> if (!(l instanceof ArrayList al)) {<br> return;<br> }</div><div>```<br><br>However #2, adding an additional `else` keyword makes the code successfully compile:<br>```<br> } else if (!(l instanceof ArrayList al)) {<br> return;<br> } else {<br> al.ensureCapacity(10);<br> System.out.println("done");<br> }</div><div>```<br></div><div><br></div><div>While option #1 and #2 are acceptable workarounds, it looks to me like there could be a bug in javac? Therefore I am bringing this to your attention so you can decide if it is a bug or not.</div><div><br></div>I searched the JDK's bug tracker for this specific case, but could not find anything related.<br><br></div><div>Thanks!</div><div>Jean-Noël</div></div>
</blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><table style="border-collapse:collapse;padding:0px;margin:0px"><tbody><tr><td style="width:113px"><a href="https://www.pingidentity.com/" rel="noreferrer noreferrer noreferrer" target="_blank"></a><a href="https://www.pingidentity.com/" rel="noreferrer noreferrer noreferrer" target="_blank"></a><a href="https://www.pingidentity.com/" rel="noreferrer noreferrer noreferrer" target="_blank"><img alt="Ping Identity" src="https://www.pingidentity.com//content/dam/picr/img/em/ping-logo.png"></a></td><td><table><tbody><tr><td style="vertical-align:top"><span style="color:rgb(230,29,60);display:inline-block;margin-bottom:3px;font-family:arial,helvetica,sans-serif;font-weight:bold;font-size:14px">Jean-Noel Rouvignac</span><br><span style="display:inline-block;margin-bottom:2px;font-family:arial,helvetica,sans-serif;font-size:14px">Senior Principal Software 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