{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
        let diag = self.demand_eqtype_pat_diag(pat.span, expected, pat_ty, &pat_info.top_info);
        // Type-check the tuple struct pattern against the expected type.
        let had_err = diag.map_err(|diag| diag.emit());