anchor.diff:        entry.write("DA:${k},${v[k]}\n");
       });
       entry.write("end_of_record\n");
  -    env.output.write(entry.toString());
  +    output.write(entry.toString());
       return new Future.value(null);
     };
   
  
positive.code:           b.write(prefix);
            prefix = b.toString();
          }
          env.output.write("${prefix}|${lines[line-1]}\n");
        }
        c.complete();
      });
  
negative.code: 
      Future out;
      if (env.prettyPrint) {
        out = prettyPrint(globalHitmap, failedLoads, env.output);
      }
      if (env.lcov) {
        out = lcov(globalHitmap, env.output);
      }
  
      out.then((_) {
  