[Mono-bugs] [Bug 339013] New: New DLR requires [Optional] parameters to have a DefaultValue of System.Reflection.Missing

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=339013

           Summary: New DLR requires [Optional] parameters to have a
                    DefaultValue of System.Reflection.Missing
           Product: Mono: Runtime
           Version: unspecified
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: misc
        AssignedTo: mono-bugs at ximian.com
        ReportedBy: miguel at novell.com
         QAContact: mono-bugs at ximian.com
          Found By: ---


The new DLR (In particular, for IronRuby) uses a feature we do not have
implemented.   

If a parameter is flagged with [System.Runtime.InteropServices.Optional] when
we retrieve the ParameterInfo for a method, the DefaultValue should be
System.Reflection.Missing instead of DBNull.

The following sample should print:
System.DBNull System.Reflection.Missing

Instead it prints:
System.DBNull and System.DBNull

using System;
using System.Reflection;
using System.Runtime.InteropServices;

class X {
        static void Main ()
        {
                ParameterInfo [] pi = typeof (X).GetMethod
("TakesInt").GetParameters ();

                Console.WriteLine ("{0} and {1}", pi [0].DefaultValue.GetType
(), pi [1].DefaultValue.GetType ());
        }

        public static void TakesInt (int b, [Optional] int a)
        {
        }
}

Found this while tracking down an error reported by John Lam when running the
test suite from IronRuby.

A simple way of reproducing the bug with IronRuby is:
rbx
>>> Dir.glob "*"


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