{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"err.span_label(lhs_sp,"}]}
                err.span_label(lhs_sp, msg(lhs_ty));
            (Some((true, lhs_ty, lhs_sp)), Some((true, rhs_ty, rhs_sp))) => {
                err.span_label(rhs_sp, msg(rhs_ty));