1  /* { dg-do compile } */
       2  
       3  struct S;
       4  #pragma omp declare reduction (+:struct S:omp_out.s += omp_in.s) /* { dg-error "invalid use of undefined type" } */
       5  struct S { int s; };
       6  #pragma omp declare reduction (*:struct S:omp_out.s *= omp_in.s)