{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"//"}]}
        // Is `pin mut self` `n` tokens ahead?
            |this: &Self, n| this.is_keyword_ahead(n, &[kw::Mut]) && is_isolated_self(this, n + 1);
        let is_isolated_pin_mut_self = |this: &Self, n| {