I think anyone's opinion on what makes something "systems programming" has a lot to do with what it meant when they learned the term. The quotes from Stroustrup and Alexandrescu, for example, very much call out language features.
I wouldnt but that sounds like something we would all read about on HN.
Personally I use go for everything.
Here is some stuff to get you started,
"The Cedar Programming Environment: A Midterm Report and Examination "
https://pdfs.semanticscholar.org/33ff/212245ff8af0359e911883...
http://www.ocp.inf.ethz.ch/wiki/Documentation/Front
https://www.whoishostingthis.com/resources/modula-3/
http://joeduffyblog.com/2015/11/03/blogging-about-midori/
https://www.infoq.com/presentations/csharp-systems-programmi...