/* Variable names. */
bool var_is_valid_name (const char *, bool issue_error);
bool var_is_plausible_name (const char *name, bool issue_error);
-int compare_var_names (const void *, const void *, void *);
-unsigned hash_var_name (const void *, void *);
+int compare_var_names (const void *, const void *, const void *);
+unsigned hash_var_name (const void *, const void *);
/* Short names. */
void var_set_short_name (struct variable *, const char *);
void var_clear_short_name (struct variable *);
/* Pointers to `struct variable', by name. */
-int compare_var_ptr_names (const void *, const void *, void *);
-unsigned hash_var_ptr_name (const void *, void *);
+int compare_var_ptr_names (const void *, const void *, const void *);
+unsigned hash_var_ptr_name (const void *, const void *);
/* Variable auxiliary data. */
void *var_attach_aux (struct variable *,