SA0102 on discard of named tuple member

[paulmey]

using System;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            (string output, _) = RunCommand();
            Console.WriteLine(output);
        }

        private static (string output, int statuscode) RunCommand()
        {
            return ("Hello World!", 0);
        }
    }
}

Results in:

Build started...
1>------ Build started: Project: test, Configuration: Debug Any CPU ------
1>  test -> c:\src\test\bin\Debug\test.exe
1>c:\src\test\Program.cs(9,1): warning : SA0102 : CSharp.CsParser : A syntax error has been discovered in file c:\src\test\Program.cs on line 9.
1>c:\src\test\Properties\AssemblyInfo.cs(1,1): warning : SA1633 : CSharp.Documentation : The file has no header, the header Xml is invalid, or the header is not located at the top of the file.
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

Using Stylecop.MSBuild 6.2.0 on .NET framework 4.6.2