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struct __attribute__((packed)) S
{
  int a, b, c;
};
 
static int __attribute__ ((noinline,noclone))
extract(const char *p)
{
  struct S s;
  __builtin_memcpy (&s, p, sizeof(struct S));
  return s.a;
}
 
volatile int i;
 
int main (void)
{
  char p[sizeof(struct S) + 1];
 
  __builtin_memset (p, 0, sizeof(struct S) + 1);
  i = extract (p + 1);
 
  return 0;
}