{"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"this.is_keyword_ahead(n,"}]}
            this.is_keyword_ahead(n, &[kw::SelfLower])
        let is_isolated_self = |this: &Self, n| {
                && this.look_ahead(n + 1, |t| t != &token::PathSep)