int* f(int x) {
  int *p;
  if (x) {
    int y = 3;
    p = &y; /* ok */
  } /* ok, but p now dangling */

  /* y = 4 does not compile */

  *p = 7; /* could CRASH but probably not */

  return p; /* uh-oh, but no crash yet */
}
void g(int *p) { *p = 123; }

int main(int argc, char **argv) {
  g(f(7)); /* HOPEFULLY YOU CRASH (but maybe not) */
}