#include <stdio.h>

typedef struct
{
	int a;
	int b;
} foo;

int main(void) {
	
	foo *ptr1 = malloc(sizeof(foo));
    void *ptr2 = NULL;
    
    ptr1 = ptr2;

	ptr2 = ptr1 + 1;
    
    free(ptr1);

	return 0;
}