1  /* PR c++/79984 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-Wnonnull-compare" } */
       4  
       5  enum { r = 1 };
       6  
       7  __attribute__ ((nonnull (r))) int
       8  f (int *p)
       9  {
      10    return p == 0; /* { dg-warning "'nonnull' argument 'p' compared to NULL" } */
      11  }