/** Free \c list, but not the items it contains. */
void symbol_list_free (symbol_list *list);
/** Return the length of \c l. */
int symbol_list_length (symbol_list const *l);
/** Free \c list, but not the items it contains. */
void symbol_list_free (symbol_list *list);
/** Return the length of \c l. */
int symbol_list_length (symbol_list const *l);