{"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_mut_self = |this: &Self, n| {
                && is_isolated_mut_self(this, n + 1)