| 
  
 test_4a 
  | 
     ‘test_4a’: events 1-2 
|    76 |   node_b.ptr = malloc (sizeof (int)); |  
 |                ^~~~~~~~~~~~~~~~~~~~~ |  
 |                | |  
 |                (1) this call could return NULL |  
|    77 |   global_ptr = &node_a; |  
|    78 |   *node_b.ptr = 42; /* { dg-warning "possibly-NULL" "possibly-NULL" } */ |  
 |   ~~~~~~~~~~~~~~~~ |  
 |               | |  
 |               (2) ‘<unknown>’ could be NULL: unchecked value from (1) |  
 
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