Colleague of mine showed me a cool feature of gnome-builder which does colour symbols based on whether they are defined or not and I was wondering whether it is possible in Emacs as well. And by that I mean whether there is already an existing solution so that I don't have to write the whole colouring backend or something like that. I'm color-theme noob, I just have one that suits me and use it. So, if there's an easy way how to add that feature by hooks, that's still fine. I'm currently using gtags backend for helm if that helps.

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