IronPython virtual getter/setter bug

VirtualAccessors.cs

public class Base {
  public virtual int Accessor {
    get; set;
  }
}

public class GetOverride: Base {
  public override int Accessor {
    get {
      return base.Accessor - 1;
    }
  }
}

public class SetOverride: Base {
  public override int Accessor {
    set {
      base.Accessor = value + 1;
    }
  }
}

VirtualAccessors.csx

// You can run this using csharp.exe that comes with Mono

// This runs fine, despite that the IronPython version does not.

LoadAssembly("VirtualAccessors.dll");

var s = new SetOverride();
var g = new GetOverride();

s.Accessor = 1;
s.Accessor;
g.Accessor = 1;
g.Accessor;

VirtualAccessors.py

# This fails with the following messages:
#   SetOverride getter failed.
#   GetOverride setter failed.

import sys

import clr
clr.AddReference("./VirtualAccessors.dll")
import SetOverride, GetOverride

s = SetOverride()
g = GetOverride()

try:
  s.Accessor = 1
except:
  print >>sys.stderr, "SetOverride setter failed."

try:
  s.Accessor
except:
  print >>sys.stderr, "SetOverride getter failed."

try:
  g.Accessor = 1
except:
  print >>sys.stderr, "GetOverride setter failed."

try:
  g.Accessor
except:
  print >>sys.stderr, "SetOverride getter failed."