| 
  
     ‘pl’: events 1-5 
|    21 |   for (sc = 0; sc < 1; ++sc) |  
 |                ~~~^~~ |  
 |                   | |  
 |                   (1) following ‘true’ branch (when ‘sc <= 0’)... |  
|    22 |     { |  
|    23 |       th.gk.hk = 0; |  
 |       ~~~~~~~~~~~~  |  
 |                | |  
 |                (2) ...to here |  
|    24 |       th.gk.bg[sc] = 0; /* { dg-warning "dereference of NULL '0'" } */ |  
 |       ~~~~~~~~~~~~~~~~ |  
 |            |  |    | |  
 |            |  |    (5) dereference of NULL ‘<unknown>’ |  
 |            |  (4) ‘0’ is NULL |  
 |            (3) ‘0’ is NULL |  
 
 |