anchor.diff:      AnalysisResult result = await driver.getResult(path);
       if (result == null) {
         p(
  -          'An AST could not be produced for the file <code>${escape(
  -          path)}</code>.',
  +          'An AST could not be produced for the file '
  +          '<code>${escape(path)}</code>.',
             raw: true);
         return;
       }
  
positive.code:     AnalysisResult result = await driver.getResult(path);
      if (result == null) {
        p(
            'An element model could not be produced for the file <code>${escape(
            path)}</code>.',
            raw: true);
        return;
      }
  
negative.code: 
    @override
    void generateContent(Map<String, String> params) {
      DiagnosticsSite diagnosticsSite = site;
  
      buf.writeln('<div class="columns">');
  
      buf.writeln('<div class="column one-half">');
      h3('Status');
      buf.writeln(writeOption('Preview-dart-2',
          diagnosticsSite.socketServer.analysisServerOptions.previewDart2));
      buf.writeln(writeOption('Instrumentation enabled',
          AnalysisEngine.instance.instrumentationService.isActive));
      buf.writeln(writeOption('Server process ID', pid));
  