1  /* { dg-do compile } */
       2  /* { dg-options "-Wunused-value -Werror" } */
       3  
       4  int main (void) { 0; }   /* { dg-error "no effect" } */
       5  
       6  /* { dg-message "warnings being treated as errors" "" { target *-*-* } 0 } */
       7  /* { dg-final { output-exists-not { target *-*-* } } } */