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struct list {
    int key;
    struct list *next;
};
 
void append(struct list *l1, struct l2)
{
    l1 = malloc(sizeof *l1);
    *l1 = l2;
    l1->next = NULL;
}
 
int main(void)
{
    struct list *l1, l2 = { 42, NULL }, l3 = { 24, NULL };
 
    append(l1, l2);
    append(l1->next, l3);
 
    for (struct list *p = l1; p != NULL; p = p->next)
        printf("%d\n", p->key);
}
 

cc1: warnings being treated as errors
prog.c:6: error: ‘struct l2’ declared inside parameter list
prog.c:6: error: its scope is only this definition or declaration, which is probably not what you want
prog.c:6: error: parameter 2 has incomplete type
prog.c: In function ‘append’:
prog.c:6: error: parameter name omitted
prog.c:8: error: implicit declaration of function ‘malloc’
prog.c:8: error: incompatible implicit declaration of built-in function ‘malloc’
prog.c:9: error: ‘l2’ undeclared (first use in this function)
prog.c:9: error: (Each undeclared identifier is reported only once
prog.c:9: error: for each function it appears in.)
prog.c:10: error: ‘NULL’ undeclared (first use in this function)
prog.c: In function ‘main’:
prog.c:15: error: ‘NULL’ undeclared (first use in this function)
prog.c:17: error: type of formal parameter 2 is incomplete
prog.c:18: error: type of formal parameter 2 is incomplete
prog.c:21: error: implicit declaration of function ‘printf’
prog.c:21: error: incompatible implicit declaration of built-in function ‘printf’

Standard output is empty