[Mono-bugs] [Bug 662108] New: mcs emits invalid IL on as operator for nullable types

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Mon Jan 3 14:37:41 EST 2011



           Summary: mcs emits invalid IL on as operator for nullable types
    Classification: Mono
           Product: Mono: Compilers
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: msafar at novell.com
        ReportedBy: gnorton at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


  The following C#:

using System;

class T {
        public static string Convert (int a) {
        return Convert (a as int?);

    public static string Convert (int? a) {
        return null;

for the T:Convert(int) method emits:

    .method public static  hidebysig 
           default string Convert (int32 a)  cil managed 
        // Method begins at RVA 0x20f4
    // Code size 17 (0x11)
    .maxstack 8
    IL_0000:  ldarg.0 
    IL_0001:  newobj instance void valuetype
    IL_0006:  unbox.any valuetype [mscorlib]System.Nullable`1<int32>
    IL_000b:  call string class T::Convert(valuetype
    IL_0010:  ret 
    } // end of method T::Convert

The unbox.any is invalid, csc doesn't emit it (altho it does a local store, but
I presume thats for the debugger).

This affects monotouch as well, so any chance of a fix on 2.6 as well as
master/2.8?  Thanks

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