IronRuby.Runtime.Calls.MetaObjectBuilder.SetError C# (CSharp) Méthode

        public void SetError(Expression/*!*/ expression) {
            Assert.NotNull(expression);
            Debug.Assert(!_error, "Error already set");

            _result = expression;
            _error = true;
        }

        private static MethodMissingBinding BindToKernelMethodMissing(MetaObjectBuilder /*!*/ metaBuilder, CallArguments /*!*/ args, string /*!*/ methodName,
                                                                      RubyMemberInfo methodMissing, RubyMethodVisibility incompatibleVisibility, bool isSuperCall)
        {
            // TODO: better specialization of method_missing methods
            if (methodMissing == null ||
                methodMissing.DeclaringModule == methodMissing.Context.KernelModule && methodMissing is RubyLibraryMethodInfo)
            {
                if (isSuperCall)
                {
                    metaBuilder.SetError(Methods.MakeMissingSuperException.OpCall(AstUtils.Constant(methodName)));
                }
                else if (incompatibleVisibility == RubyMethodVisibility.Private)
                {
                    metaBuilder.SetError(Methods.MakePrivateMethodCalledError.OpCall(
                                             AstUtils.Convert(args.MetaContext.Expression, typeof(RubyContext)), args.TargetExpression, AstUtils.Constant(methodName))
                                         );
                }
                else if (incompatibleVisibility == RubyMethodVisibility.Protected)
                {
                    metaBuilder.SetError(Methods.MakeProtectedMethodCalledError.OpCall(
                                             AstUtils.Convert(args.MetaContext.Expression, typeof(RubyContext)), args.TargetExpression, AstUtils.Constant(methodName))
                                         );
                }
                else
                {
                    return(MethodMissingBinding.Fallback);
                }

                return(MethodMissingBinding.Error);
            }

            return(MethodMissingBinding.Custom);
        }