Ref returns/locals: Extract Method does not generate ref-returning methods

[dpoeschl]

Extract method ref M() in:

class Program
{
    public ref int M()
    {
        return ref M(); // extract method on the returned expression
    }
}

Expected: The returned value should still be marked ref and the generated method should be marked ref

class Program
{
    public ref int M()
    {
        return ref NewMethod();
    }

    private ref int NewMethod()
    {
        return ref M(); // Extract method on this
    }
}

Actual: Neither location is marked ref, causing two errors.

class Program
{
    public ref int M()
    {
        return NewMethod();      // CS 8895
    }

    private int NewMethod()
    {
        return ref M(); // Extract method on this         // CS 8894
    }
}

[DustinCampbell]

@jaredpar - here's another for the compiler.