{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"if"}]}
        if let Err(reported) = self.demand_eqtype_pat(span, expected, pat_ty, &pat_info.top_info) {
        let pat_ty = Ty::new_tup(tcx, element_tys);
            // Walk subpatterns with an expected type of `err` in this case to silence