struct llx *llx_min (const struct llx *r0, const struct llx *r1,
llx_compare_func *, void *aux);
int llx_lexicographical_compare_3way (const struct llx *a0,
struct llx *llx_min (const struct llx *r0, const struct llx *r1,
llx_compare_func *, void *aux);
int llx_lexicographical_compare_3way (const struct llx *a0,