anchor.diff:    int pid;
     OutputLog stdout = new OutputLog();
     OutputLog stderr = new OutputLog();
  +  List<String> diagnostics = <String>[];
     bool compilationSkipped = false;
     Completer<CommandOutput> completer;
   
  
positive.code: 
            // Close stdin so that tests that try to block on input will fail.
            process.stdin.close();
            void timeoutHandler() {
              timedOut = true;
              if (process != null) {
                if (io.Platform.isLinux) {
                  // Try to print stack traces of the timed out process.
                  io.Process.run('eu-stack', ['-p ${process.pid}'])
                  .then((result) {
                    io.stdout.write(result.stdout);
                    io.stderr.write(result.stderr);
                  })
                  .catchError(
                      (error) => print("Error when printing stack trace: $error"))
                  .whenComplete(() {
                    if (!process.kill()) {
                      DebugLogger.error("Unable to kill ${process.pid}");
                    }
                  });
                } else if (io.Platform.isMacOS) {
                  // Try to print stack traces of the timed out process.
                  // `sample` is a sampling profiler but we ask it sample for 1
                  // second with a 4 second delay between samples so that we only
                  // sample the threads once.
                  io.Process.run('/usr/bin/sample',
                                 ['${process.pid}', '1', '4000', '-mayDie'])
                  .then((result) {
                    io.stdout.write(result.stdout);
                    io.stderr.write(result.stderr);
                  })
                  .catchError(
                      (error) => print("Error when printing stack trace: $error"))
                  .whenComplete(() {
                    if (!process.kill()) {
                      DebugLogger.error("Unable to kill ${process.pid}");
                    }
                  });
                } else {
                  if (!process.kill()) {
                    DebugLogger.error("Unable to kill ${process.pid}");
                  }
                }
              }
            }
  
negative.code:         new DateTime.now().difference(startTime),
          compilationSkipped,
          pid);
      commandOutput.diagnostics.addAll(diagnostics);
      return commandOutput;
    }
  
  