1  struct A1 {};
       2  struct A2 {};
       3  struct B1 { struct A1 a; struct A2 b; };
       4  struct B2 { struct A1 a; struct A2 b; };
       5  struct C1 { struct B1 a; struct B2 b; };
       6  struct C2 { struct B1 a; struct B2 b; };
       7  struct D1 { struct C1 a; struct C2 b; };
       8  struct D2 { struct C1 a; struct C2 b; };
       9  struct E1 { struct D1 a; struct D2 b; };
      10  struct E2 { struct D1 a; struct D2 b; };
      11  struct F1 { struct E1 a; struct E2 b; };
      12  struct F2 { struct E1 a; struct E2 b; };
      13  struct G1 { struct F1 a; struct F2 b; };
      14  struct G2 { struct F1 a; struct F2 b; };
      15  struct H1 { struct G1 a; struct G2 b; };
      16  struct H2 { struct G1 a; struct G2 b; };
      17  struct I1 { struct H1 a; struct H2 b; };
      18  struct I2 { struct H1 a; struct H2 b; };
      19  struct J1 { struct I1 a; struct I2 b; };
      20  struct J2 { struct I1 a; struct I2 b; };
      21  struct dummy { struct J1 a; struct J2 b; };
      22  
      23  struct foo
      24  {
      25    int i1;
      26    int i2;
      27    int i3;
      28    int i4;
      29    int i5;
      30  };