What's a good syntax theme for debugging grammars?


I’ve recently started hacking on the language-go package to fix some strange highlighting issues I’d noticed, but I find myself needing to flip themes often to make sure I can see how it’s actually marking tokens; for example, with Monokai, keywords and operators are styled the same.

Is there a syntax theme that styles every token classifier distinctly? I can override individual ones that I notice colliding in my personal stylesheet, but it would be useful to have a theme that made them all stand out, even if it was really ugly.