Get the latest tech news
Neovim Pack
Neovim user documentation
If the "foobar" plugin kicks in and sets the'filetype' to "some", Nvim will find the syntax/some.vim file, because its directory is in the runtime search path. If you don't have a package but a single plugin, you need to create the extra directory level: Target plugins should be Git repositories with versions as named tags following semver convention v<major>.<minor>.<patch>.
Or read this on Hacker News