struct psi_num_exp *psi_num_exp_init_unary(token_t op,
struct psi_num_exp *u);
struct psi_num_exp *psi_num_exp_init_num(struct psi_number *n);
struct psi_num_exp *psi_num_exp_init_unary(token_t op,
struct psi_num_exp *u);
struct psi_num_exp *psi_num_exp_init_num(struct psi_number *n);