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<p class="MsoNormal">Hi team,</p>
<p class="MsoNormal">Reading <a href="https://cr.openjdk.org/~abimpoudis/instanceof/jep455-20231030/specs/instanceof-jls.html#jls-15.20.2">
JEP 455 spec</a>, I see this:</p>
<p><strong><span style="font-family:"Calibri",sans-serif">The type of the expression
</span></strong><em><b><span style="font-family:"Calibri",sans-serif">RelationalExpression</span></b></em><strong><span style="font-family:"Calibri",sans-serif"> can be a reference type, a primitive type</span></strong>
<strong><span style="font-family:"Calibri",sans-serif">or the null type.</span></strong></p>
<p class="MsoNormal">And then, later:</p>
<p>The following rules apply when <code><span style="font-size:10.0pt">instanceof</span></code> is the pattern match operator:</p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style="mso-ligatures:none">The type of the expression <em><span style="font-family:"Calibri",sans-serif">RelationalExpression</span></em> must be a reference type or the null type, or a compile-time error occurs.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But I would expect that primitive types in patterns should be good, too. And in the freshest version of
<a href="https://mach5.us.oracle.com/mdash/buildIds/2023-11-06-1633093.angelos.bimpoudis.dev">
JEP_455 JDK</a>, both examples compile and print “Yes”:</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Courier New";color:black;mso-ligatures:none">Integer x
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">=
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#1750EB;mso-ligatures:none">5</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">;<br>
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#0033B3;mso-ligatures:none">if
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">(</span><span style="font-size:10.0pt;font-family:"Courier New";color:black;mso-ligatures:none">x
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#0033B3;mso-ligatures:none">instanceof int
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">y)
</span><span style="font-size:10.0pt;font-family:"Courier New";color:black;mso-ligatures:none">System</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">.</span><i><span style="font-size:10.0pt;font-family:"Courier New";color:#871094;mso-ligatures:none">out</span></i><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">.println(</span><span style="font-size:10.0pt;font-family:"Courier New";color:#067D17;mso-ligatures:none">"Yes"</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">);<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Courier New";color:#0033B3;mso-ligatures:none">int
</span><span style="font-size:10.0pt;font-family:"Courier New";color:black;mso-ligatures:none">x
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">=
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#1750EB;mso-ligatures:none">5</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">;<br>
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#0033B3;mso-ligatures:none">if
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">(</span><span style="font-size:10.0pt;font-family:"Courier New";color:black;mso-ligatures:none">x
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#0033B3;mso-ligatures:none">instanceof
</span><span style="font-size:10.0pt;font-family:"Courier New";color:black;mso-ligatures:none">Integer
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">y)
</span><span style="font-size:10.0pt;font-family:"Courier New";color:black;mso-ligatures:none">System</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">.</span><i><span style="font-size:10.0pt;font-family:"Courier New";color:#871094;mso-ligatures:none">out</span></i><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">.println(</span><span style="font-size:10.0pt;font-family:"Courier New";color:#067D17;mso-ligatures:none">"Yes"</span><span style="font-size:10.0pt;font-family:"Courier New";color:#080808;mso-ligatures:none">);<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Shouldn’t the spec be updated?</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you,</p>
<p class="MsoNormal">Ella Ananeva</p>
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