| 
  
 test_23 
  | 
     ‘test_23’: events 1-2 
|   262 |   int *ptr = (int *)calloc (n, sizeof (int)); |  
 |                     ^~~~~~~~~~~~~~~~~~~~~~~~ |  
 |                     | |  
 |                     (1) this call could return NULL |  
|   263 |   ptr[0] = 42; /* { dg-warning "dereference of possibly-NULL 'ptr'" } */ |  
 |   ~~~~~~~~~~~         |  
 |          | |  
 |          (2) ‘ptr’ could be NULL: unchecked value from (1) |  
 
 |   
 |