anchor.diff:            print("  Command: java -jar $file");
             print("  Error: $e");
             // TODO(ahe): How to report this as a test failure?
  -          exit(1);
  +          io.exit(1);
             return true;
           });
         }
  
positive.code:       // If there is an error starting a batch process, chances are that
        // it will always fail. So rather than re-trying a 1000+ times, we
        // exit.
        exit(1);
        return true;
      });
    }
  
negative.code:         print("  Command: $cmd ${arg.join(' ')}");
          print("  Error: $e");
          // TODO(ahe): How to report this as a test failure?
          io.exit(1);
          return true;
        });
      }
  