#include <stdio.h>
#include <stddef.h>

#define container_of(ptr, type, member) ({ \
	const typeof(((type*)0)->member)* __mptr = (ptr); \
	(type*)((char*)__mptr - offsetof(type, member)); })

struct A;
struct B;

struct A {
	char m0;
	int m1;
	struct B* m2;
};

struct B {
	int m0;
	char m1;
	short m2;
	struct A* m3;
	float m4;
	struct A m5;
	struct B* m6;
} __attribute__((slr));

int main(int argc, char** argv) {
	struct A a = { 'x', 52, NULL };
	struct B b = { 1, 2, 3, NULL, 4.f, a, NULL };

	b.m2 = 42;
	return 0;
}