{"ast_node_type":"function","tokens":[{"end":90,"kind":"keyword","start":0,"text":"fn"}]}
    fn check_path_sep_and_look_ahead(&mut self, looker: impl Fn(&Token) -> bool) -> bool {
    /// Checks for `::` or, potentially, `:::` and then look ahead after it.
        if self.check(exp!(PathSep)) {