Marat Amerov

https://github.com/neoclide/coc-highlight can do it. Maybe its source code can help to invent. 

fixed it by adding `autocmd BufRead,BufNewFile *.html.erb set filetype=eruby.html`

> It's working fine for me. What does `:echo b:ruby_no_expensive` report? 1

I use [vim-matchup](https://github.com/andymass/vim-matchup) but I was try without this plugin and navigate with `%` I got some result.