__pop_cond_false_stack
struct stree *__pop_cond_false_stack(void);
a_T_b_F = combine_strees(a_T, a_T_b_fake, __pop_cond_false_stack());
a_F_c_F = combine_strees(a_F, a_F_c_fake, __pop_cond_false_stack());
tmp = __pop_cond_false_stack();