anchor.diff:  
     Future<int> launch() {
       String dartExecutable = Platform.executable;
  +    print('** Launching $scriptPath');
       return Process.start(dartExecutable,
                            ['--enable-vm-service:0', scriptPath]).then((p) {
   
  
positive.code:         return response
              .fold(new BytesBuilder(), (b, d) => b..add(d))
              .then((builder) {
                _requestCompleted(builder.takeBytes(), response);
              });
        }).catchError((error) {
  
negative.code:           completer.complete(portNumber);
            // Stop repeat completions.
            first = false;
            print('** Signaled to run test queries on $portNumber');
          }
          print(line);
        });
  