gistfile1.cs

namespace RestSharp.Deserializers
{
    public class XmlDeserializer : IDeserializer
    {
        ...

        private void Map(object x, XElement root)
        {
            ...

            else if (type.IsGenericType)
            {
                var t = type.GetGenericArguments()[0];
                var list = (IList)Activator.CreateInstance(type);

                // is 'root' meant to be the content of the ENTIRE xml document?
                var container = GetElementByName(root, prop.Name.AsNamespaced(Namespace));
                var first = container.Elements().FirstOrDefault();

                var elements = container.Elements(first.Name);
                PopulateListFromElements(t, elements, list);

                prop.SetValue(x, list, null);
            }