diff -urN r464/IronPython/Src/IronPython/Compiler/MethodBinder.cs wc/IronPython/Src/IronPython/Compiler/MethodBinder.cs
--- r464/IronPython/Src/IronPython/Compiler/MethodBinder.cs	2006-06-14 10:15:01.000000000 +0900
+++ wc/IronPython/Src/IronPython/Compiler/MethodBinder.cs	2006-06-14 10:33:21.000000000 +0900
@@ -81,11 +81,11 @@
             return ts.MakeCallTarget(needsContext);
         }
 
-        public object CallWithContextN(ICallerContext context, object[] args) {
+        public object CallWithContextN(ICallerContext context, params object[] args) {
             return Call(context, CallType.None, args);
         }
 
-        public object CallN(object[] args) {
+        public object CallN(params object[] args) {
             return Call(null, CallType.None, args);
         }
 
@@ -419,7 +419,9 @@
                 Parameter p1 = parameters1[i];
                 Parameter p2 = parameters2[i];
                 int? cmp = p1.CompareTo(p2);
-                switch (ret) {
+                if (ret == null)
+                    if (cmp != 0) return cmp;
+                switch ((int)ret) {
                     case 0:
                         ret = cmp; break;
                     case +1:
@@ -428,9 +430,6 @@
                     case -1:
                         if (cmp == +1) return null;
                         break;
-                    case null:
-                        if (cmp != 0) ret = cmp;
-                        break;
                     default:
                         throw new Exception();
                 }