1  /* { dg-do compile } */
       2  /* { dg-require-effective-target alloca } */
       3  
       4  void foo(int n)
       5  {
       6    struct X { int a[n]; } y;
       7  
       8    struct X baz (struct X x)
       9      {
      10        x.a[0] = 1;
      11        return x;
      12      }
      13  
      14    y.a[0] = 0;
      15    y = baz(y);
      16    if (y.a[0] != 1)
      17      __builtin_abort ();
      18  }