#define list_append(list, e) {sizeof((list)->next);list_append_(&(list),(e));}
#define list_free(list) {sizeof((list)->next);list_free_(&(list));}
#define list_clone(list) (sizeof((list)->next),list_clone_(&(list)))
#define list_append(list, e) {sizeof((list)->next);list_append_(&(list),(e));}
#define list_free(list) {sizeof((list)->next);list_free_(&(list));}
#define list_clone(list) (sizeof((list)->next),list_clone_(&(list)))