NullReferenceException when argument implements IEnumerable

[frolyo]

if I make IInput not implementing IEnumerable, then NullRef does not occur.

using System.Collections.Generic;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Moq;

[TestClass]
public class FooTest
{
    [TestMethod]
    public void ShouldCalculate()
    {
        var mocks = new MockRepository(MockBehavior.Loose);
        var service = mocks.Create<IDependency>();

        var input1 = mocks.OneOf<IInput>();
        service.Setup(x => x.Run(input1)).Returns(1);

        var input2 = mocks.OneOf<IInput>();
        service.Setup(x => x.Run(input2)).Returns(2);

        var foo = new Foo(service.Object);
        foo.Calculate(input1);
        foo.Calculate(input2);
    }
}

public interface IDependency
{
    decimal Run(IInput input);
}

public interface IInput : IEnumerable<int>
{
}

public class Foo
{
    private readonly IDependency dependency;

    public Foo(IDependency dependency)
    {
        this.dependency = dependency;
    }

    public void Calculate(IInput input)
    {
        this.dependency.Run(input);
    }
}

[stakx]

This will be fixed in the next release of Moq (version >4.7.63).