gistfile1.cs

        public void VisitNode (JSBinaryOperatorExpression boe) {
            if (boe.Operator != JSOperator.Assignment) {
                base.VisitNode(boe);
                return;
            }

            if (IsStruct(boe.Left.GetExpectedType(TypeSystem)) || IsStruct(boe.Right.GetExpectedType(TypeSystem))) {
                Debug.WriteLine(String.Format("struct assignment {0} = {1}", boe.Left, boe.Right));
                if (boe.Right is JSLiteral) {
                    Debug.WriteLine("  copy not needed, literal");
                } else if (boe.Right is JSInvocationExpression) {
                    Debug.WriteLine("  copy not needed, invocation result");
                } else {
                    Debug.WriteLine("  copy introduced");
                    boe.Right = new JSInvocationExpression(new JSDotExpression(boe.Right, CLR.MemberwiseClone));
                }
            }

            VisitChildren(boe);
        }