C# compiler issue "failed to emit module"

    class Program {
        static void Main() {
            IServiceProvider provider = null;
            DoWork(provider.GetService<>());
        }

        static void DoWork(IDisposable service) {
        }
    }

    static class Extension {
        public static T GetService<T>(this IServiceProvider provider) {
            return default(T);
        }
    }