anchor.diff:  // dist->histogram ~ {0,0}
   inform_dist_free(dist);
   ----
  +[horizontal]
  +Header::
  +    `inform/dist.h`
   ****
   
   ****
  
positive.code: assert(inform_dist_prob(dist, 2) == 0.50);
  inform_dist_free(dist);
  ----
  ****
  
  ****
  
negative.code: assert(inform_dist_counts(dist) == 10);
  inform_dist_free(dist);
  ----
  [horizontal]
  Header::
      `inform/dist.h`
  ****
  
  ****
  