Switch on Nullable Boolean : case goes to null when value is true

Question

I realize the proper way to handle nullable types is to use the HasValue property. But I would like to know why the following switch statement breaks on the null case instea

Answer 1

This is going to be a very short answer: You just hit Roslyn bug #4701, reported two weeks ago.

The milestone is set to 1.1, so right now you'll have to workaround this with a separate if clause, while waiting for the next compiler update.

Answer 2

This is not an answer, I am just sharing IL code generated by VS2013 and VS2015.

Original C# code:

public void Testing()
{
    bool? boolValue = true;

    switch (boolValue)
    {

        case null:

            Console.WriteLine("null");

            break; 

        default:
            Console.WriteLine("default");

            break;
    }
}

VS2013 IL (decompiled):

public void Testing()
{
    bool? boolValue = new bool?(true);
    bool valueOrDefault = boolValue.GetValueOrDefault();
    if (boolValue.HasValue)
    {
        Console.WriteLine("default");
    }
    else
    {
        Console.WriteLine("null");
    }
}

VS2015 IL (decompiled):

public void Testing()
{
    bool? flag = new bool?(true);
    bool? flag2 = flag;
    bool? flag3 = flag2;
    if (flag3.HasValue)
    {
        bool valueOrDefault = flag3.GetValueOrDefault();
    }
    Console.WriteLine("null");
}