i have seen people using C for syntax highlighting. given how primitive VCL is in terms of constructs, i guess there won't be much difference between ruby and C. both will have occasional random things highlight (not too likely) and both won't highlight the built-in constructs and system method names of vcl. lets go with ruby as you say it looks ok.

if you want to have better highlighting in the future, it could be possible to submit a PR to Pygments adding a new highlighter.@javiereguiluz did it for Twig.

Thanks Christian.