{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"infcx.sub_regions(SubregionOrigin::RelateObjectBound(span),"}]}
            infcx.sub_regions(SubregionOrigin::RelateObjectBound(span), r_b, r_a);
        (&ty::Ref(r_a, ty_a, mutbl_a), &ty::Ref(r_b, ty_b, mutbl_b)) => {
            let mt_a = ty::TypeAndMut { ty: ty_a, mutbl: mutbl_a };