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<TITLE> [Mono-bugs] [Bug 75156][Nor] New - [GMCS] miscompiles 'is' statement
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<H1>[Mono-bugs] [Bug 75156][Nor] New - [GMCS] miscompiles 'is' statement</H1>
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<B>bugzilla-daemon at bugzilla.ximian.com</B>
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<A HREF="mailto:mono-bugs%40lists.ximian.com?Subject=%5BMono-bugs%5D%20%5BBug%2075156%5D%5BNor%5D%20New%20-%20%5BGMCS%5D%20miscompiles%20%27is%27%20statement&In-Reply-To=bug-75156%40chernobyl.ximian.com"
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TITLE="[Mono-bugs] [Bug 75156][Nor] New - [GMCS] miscompiles 'is' statement">bugzilla-daemon at bugzilla.ximian.com
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</A><BR>
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<I>Sat Jun 4 13:21:20 EDT 2005</I>
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<PRE>Please do not reply to this email- if you want to comment on the bug, go to the
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URL shown below and enter your comments there.
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Changed by <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">vargaz at gmail.com.</A>
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<A HREF="http://bugzilla.ximian.com/show_bug.cgi?id=75156">http://bugzilla.ximian.com/show_bug.cgi?id=75156</A>
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--- shadow/75156 2005-06-04 13:21:20.000000000 -0400
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+++ shadow/75156.tmp.6203 2005-06-04 13:21:20.000000000 -0400
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@@ -0,0 +1,54 @@
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+Bug#: 75156
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+Product: Mono: Compilers
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+Version: unspecified
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+OS:
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+OS Details:
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+Status: NEW
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+Resolution:
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+Severity:
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+Priority: Normal
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+Component: C#
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+AssignedTo: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">mono-bugs at ximian.com</A>
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+ReportedBy: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">vargaz at gmail.com</A>
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+QAContact: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">mono-bugs at ximian.com</A>
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+TargetMilestone: ---
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+URL:
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+Cc:
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+Summary: [GMCS] miscompiles 'is' statement
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+
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+Testcase:
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+
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+<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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+using System;
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+using System.Reflection;
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+
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+public class Tests {
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+
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+ public void GetName (MethodBase method, out object retType) {
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+ retType = method is ConstructorInfo ? new Object () : new Object ();
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+ }
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+
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+ public static void Main () {
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+ object o;
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+ new Tests ().GetName (typeof (Tests).GetMethod ("Main"), out o);
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+ }
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+}
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+<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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+
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+When compiling this with gmcs, it prints:
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+
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+uj.cs(7) warning CS0184: The given expression is never of the provided
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+('System.Nullable`1') type
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+
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+also, the generated IL looks doesn't contain an isinst instruction at all:
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+
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+ .maxstack 8
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+ IL_0000: ldarg.2
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+ IL_0001: br IL_0010
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+
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+ IL_0006: newobj instance void object::.ctor()
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+ IL_000b: br IL_0015
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+
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+ IL_0010: newobj instance void object::.ctor()
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+ IL_0015: stind.ref
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+ IL_0016: ret
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</PRE>
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