{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"this.look_ahead(n,"}]}
            this.look_ahead(n, |token| token.is_ident_named(sym::pin))
        let is_isolated_pin_const_self = |this: &Self, n| {
                && this.is_keyword_ahead(n + 1, &[kw::Const])