1  /* PR c/51034 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-std=gnu99" } */
       4  
       5  struct S;
       6  
       7  int
       8  main ()
       9  {
      10    struct R { typeof (((struct W) {})) x; } r;	/* { dg-error "invalid use of undefined type" } */
      11    struct S { typeof (((struct S) {})) x; } s;	/* { dg-error "invalid use of undefined type" } */
      12    struct T { int x[sizeof ((struct T) {})]; } t;/* { dg-error "invalid use of undefined type" } */
      13    struct U { int x[sizeof((struct V){})];} u;	/* { dg-error "invalid use of undefined type" } */
      14  }