1 #include <ccan/container_of/container_of.h>
2 #include <stdlib.h>
3 
4 struct foo {
5 	int a;
6 	char b;
7 };
8 
main(void)9 int main(void)
10 {
11 	struct foo foo = { .a = 1, .b = 2 };
12 	int *intp = &foo.a;
13 	char *p;
14 
15 #ifdef FAIL
16 	/* p is a char *, but this gives a struct foo * */
17 	p = container_of(intp, struct foo, a);
18 #else
19 	p = (char *)intp;
20 #endif
21 	return p == NULL;
22 }
23