__pop_cond_true_stack
struct stree *__pop_cond_true_stack(void);
a_T_b_T = combine_strees(a_T, a_T_b_fake, __pop_cond_true_stack());
a_F_c_T = combine_strees(a_F, a_F_c_fake, __pop_cond_true_stack());
tmp = __pop_cond_true_stack();