Repro - Open Generics Not Supported in MEF v2 Preview 4?

gistfile1.cs

using System.ComponentModel.Composition.Hosting;
using System.ComponentModel.Composition.Registration;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace System.ComponentModel.Composition
{
    [TestClass]
    public class RegistrationBuilderTestBF
    {
        public interface IRepository<out T> {
            T Get();
        }

        public class SomeModel { }

        public class Repository<T> : IRepository<T> {
            public T Get()
            {
                return default(T);
            }
        }

        public class SomeController
        {
            public SomeController(IRepository<SomeModel> someModel) {

            }
        }

        [TestMethod]
        public void RegistrationBuilder_WithOpenGeneric_ShouldCreateType()
        {
            var rb = new RegistrationBuilder();
            rb.ForType<SomeController>().Export();
            rb.ForTypesDerivedFrom(typeof(IRepository<>)).Export();
            var newCatalog = new AssemblyCatalog(typeof(RegistrationBuilderTestBF).Assembly, rb);

            var provider = new CatalogExportProvider(newCatalog);

            Assert.IsNotNull(provider.GetExport<SomeController>());
        }
    }
}