NullReferenceException in Match`1.Matches(Object value)

What steps will reproduce the problem?

using Microsoft.VisualStudio.TestTools.UnitTesting;
using Moq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Testing.Tests
{
    [TestClass]
    public class Tests
    {
        public interface ITest
        {
            Task<int> TestMethod(int? i);
        }

        [TestMethod]
        public async Task MyTest()
        {
            var mock = new Mock<ITest>();

            mock.Setup(m => m.TestMethod(It.IsAny<int>()))
                .ReturnsAsync(0);
            mock.Setup(m => m.TestMethod(It.IsAny<int?>()))
                .ReturnsAsync(0);

            await mock.Object.TestMethod(null);
        }
    }
}

What is the expected output? What do you see instead?
The test to pass without a Moq internal exception. A NullReferenceExecption 
from Moq.

What version of the product are you using? On what operating system?
Moq - 4.2.1502.911
.NET - v4.0.20926
Windows 7 Professional SP 1 x64
Visual Studio Professional 2013 - 12.0.31101.00 Update 4

Please provide any additional information below.

This exception provides the following information:

Message: Object reference not set to an instance of an object.
StackTrace:    at Moq.Match`1.Matches(Object value)
   at Moq.Matchers.Matcher.Matches(Object value)
   at Moq.MethodCall.Matches(ICallContext call)
   at Moq.ExtractProxyCall.<>c__DisplayClass1.<HandleIntercept>b__0(IProxyCall c)
   at System.Linq.Enumerable.LastOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
   at Moq.ExtractProxyCall.HandleIntercept(ICallContext invocation, InterceptorContext ctx, CurrentInterceptContext localctx)
   at Moq.Interceptor.Intercept(ICallContext invocation)
   at Moq.Proxy.CastleProxyFactory.Interceptor.Intercept(IInvocation invocation)
   at Castle.DynamicProxy.AbstractInvocation.Proceed()
   at Castle.Proxies.ITestProxy.TestMethod(Nullable`1 i)
   at Testing.Tests.<MyTest>d__0.MoveNext() in c:\Code\...\Tests.cs:line 31

The follow two code samples work as expected:

[TestMethod]
public async Task MyTest()
{
    var mock = new Mock<ITest>();

    //mock.Setup(m => m.TestMethod(It.IsAny<int>()))
       //  .ReturnsAsync(0);
    mock.Setup(m => m.TestMethod(It.IsAny<int?>()))
        .ReturnsAsync(0);

    await mock.Object.TestMethod(null);
}

[TestMethod]
public async Task MyTest()
{
    var mock = new Mock<ITest>();

    mock.Setup(m => m.TestMethod(It.IsAny<int>()))
        .ReturnsAsync(0);
    mock.Setup(m => m.TestMethod(It.IsAny<int?>()))
        .ReturnsAsync(0);

    await mock.Object.TestMethod(0);
}

The issues seems to be a difficulty to evaluate what should be called due to 
the `null` passed into the Moq'ed method, as the first setup is for type `int` 
and the second is for type `int?`.
Original issue reported on code.google.com by mojoca...@gmail.com on 12 Mar 2015 at 5:04
soorajmamar / moq

NullReferenceException in Match`1.Matches(Object value) #382
