{"ast_node_type":"variable","tokens":[{"end":37,"kind":"keyword","start":0,"text":"let"}]}
        let hi = span.shrink_to_hi();
        let box_kw_and_lo = box_kw.until(self.interpolated_or_expr_span(&expr));
        let sugg = errors::AddBoxNew { box_kw_and_lo, hi };