__isl_take isl_basic_set *bset, int n_op, int n_region,
struct isl_region *region,
int (*conflict)(int con, void *user), void *user);
__isl_take isl_basic_set *bset, int n_op, int n_region,
struct isl_region *region,
int (*conflict)(int con, void *user), void *user);