/in/correct/dlist.c:220:44: error: pointer cannot be cast to type 'double'
            fprintf(stdout, "%lf", (double)(tmp->key));
                                           ^~~~~~~~~~
/in/correct/dlist.c:245:16: error: passing 'const char *' to parameter of type 'char *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
     insert(a, key, this);
               ^~~
/in/correct/dlist.c:42:29: note: passing argument to parameter 'name' here
void insert(void* op, char *name, list_t *list) {
                            ^
2 errors generated.