VS Code extension providing IntelliSense for Menhir grammars. In order to work, it needs the Menhir language server menhir-lsp, which can be installed with opam:
opam install menhir-lsp
Then language support will be available on all your .mly files.
Features
Auto-completion for your grammar's terminals and rules, plus Menhir's standard library rules
References View (Shift+F12 on any symbol)
Jump to definition (Ctrl-click on any symbol)
Hover info for token aliases and standard library rules