procedure.c question

[Jason Stover]

Now I'm reading procedure.c. 

execute_transformations() is called in write_case(). t_trns holds all
the transformations. When I call add_transformation (yudda yudda) from
regression.q in subcommand_save(), I can see t_trns[0] alloc'd and
initialized in procedure.c. But then in write_case() later, t_trns is
still 0x0. But from the DESCRIPTIVES procedure, I can see that t_trns
is not NULL in write_case(). ???

I know I'm missing something very important here, and probably
something obvious, but I just can't see it. Any advice? 

-Jason