void (*var_deleted) (struct dictionary *, const struct variable *,
int dict_index, int case_index, void *);
void (*var_changed) (struct dictionary *, int, unsigned int, const struct variable *, void *);
void (*var_deleted) (struct dictionary *, const struct variable *,
int dict_index, int case_index, void *);
void (*var_changed) (struct dictionary *, int, unsigned int, const struct variable *, void *);