1#include <stdlib.h>
2#include <unistd.h>
3
4int main(void)
5{
6   int y = 0;
7   int* x = calloc(1,sizeof(int));
8   free(x);
9
10   y += x[0];
11   sleep(1);
12   y += x[0];
13
14   return y;
15}
16