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    <p>I think this is a bug. If you look at the generated bytecode:</p> <pre><code> public int compare(java.lang.Object, java.lang.Object); Code: Stack=4, Locals=7, Args_size=3 0: aload_1 1: astore_3 2: aload_2 3: astore 4 5: aload_3 6: instanceof #8; //class java/lang/Integer 9: ifeq 81 12: aload_3 13: invokestatic #14; //Method scala/runtime/BoxesRunTime.unboxToInt:(Ljava/lang/Object;)I 16: istore 5 18: aload 4 20: instanceof #8; //class java/lang/Integer 23: ifeq 45 26: getstatic #20; //Field scala/Predef$.MODULE$:Lscala/Predef$; 29: iload 5 31: invokevirtual #24; //Method scala/Predef$.intWrapper:(I)Lscala/runtime/RichInt; 34: aload 4 36: invokestatic #14; //Method scala/runtime/BoxesRunTime.unboxToInt:(Ljava/lang/Object;)I 39: invokevirtual #29; //Method scala/runtime/RichInt.compare:(I)I 42: goto 124 45: new #31; //class java/lang/Exception //part omitted for brevity.. 81: aload_3 82: instanceof #54; //class java/lang/Number 85: ifeq 161 88: aload_3 89: checkcast #54; //class java/lang/Number 92: astore 6 94: aload 4 96: instanceof #54; //class java/lang/Number 99: ifeq 125 102: getstatic #20; //Field scala/Predef$.MODULE$:Lscala/Predef$; 105: aload 6 107: invokevirtual #58; //Method java/lang/Number.doubleValue:()D 110: invokevirtual #62; //Method scala/Predef$.doubleWrapper:(D)Lscala/runtime/RichDouble; 113: aload 4 115: checkcast #54; //class java/lang/Number 118: invokevirtual #58; //Method java/lang/Number.doubleValue:()D </code></pre> <p>In line 6, the check is done whether the first variable is an instance of <code>java.lang.Integer</code>. If this does not succeed, we continue at line 81, which starts with the <code>java.lang.Number</code> check. If the first variable is an Integer, then we continue with the same check for the second variable. However, if this second check does not succeed, instead of again continuing at line 81 with the Number check, a jump is made to line 45, which throws the Exception. That does not seem to be correct. I quickly browsed through trac but couldn't directly find an issue regarding this<strike>, so it may be sensible to create one</strike>.</p> <p><strong>Edit</strong> As Extempore pointed out, it is a bug that is already in trac, see his comment below.</p>
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    1. USArjan Blokzijl
    1. USArjan Blokzijl
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    1. COThis is a manifestation of #1697 / #2337. See http://lampsvn.epfl.ch/trac/scala/ticket/2337 .
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    2. COAh, good to know, thanks!
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    3. COThank you. I have added this as yet another example for the ticket.
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      1. USAndrey
 

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