{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"check_mutbl(mt_a,"}]}
            check_mutbl(mt_a, mt_b, &|ty| Ty::new_imm_ptr(tcx, ty))
            let mt_b = ty::TypeAndMut { ty: ty_b, mutbl: mutbl_b };
        }