Something I mentioned previously, there is notion of scopes in tree-sitter
docs, see the Local Variables section
here:https://tree-sitter.github.io/tree-sitter/syntax-highlighting#local-variables
Basically to know which symbols are defined and for how long, the parser needs
additional help from the major mode author.
Neovim's definition
here:https://github.com/nvim-treesitter/nvim-treesitter/blob/master/queries/ruby/locals.scm
Good call. I’ll add it to my TODO list, but it’ll have a lower priority, since
I personally aren’t really interested in coloring variables different colors.
If someone is interested, do please give it a try.