status: the majority of sources in
examples (Hare stdlib) is recognized fine - sources containing
\\ in strings fail, due to them getting parsed as comments
as a consequence to tree-sitter precedence rules.
For a list of features offered by tree-sitter refer to their site. Summarily, one of the main features is context-aware highlight (e.g. local variables are highlighted differently than function parameters).
This grammar can be used in a number of editors and different situations (github uses it, for example) - at this stage it must be inserted manually into your editor. See, for example, nvim-treesitter.