typedef struct
{
  char x;
} T;

T
f (s1)
     T s1;
{
  T s1a;
  s1a.x = 17;
  return s1a;
}

main ()
{
  T s1a, s1b;
  s1a.x = 13;
  s1b = f (s1a);
  if (s1a.x != 13 || s1b.x != 17)
    abort ();
  exit (0);
}