anchor.diff:  
       buf.writeln('</div>');
     }
  -
  -  void generateNotApplicablePage() {
  -    buf.write('This page is not applicable for this server.');
  -  }
   }
   
   class DiagnosticsSite extends Site implements AbstractGetHandler {
  
positive.code: class ExceptionPage extends DiagnosticPage {
    final StackTrace trace;
  
    ExceptionPage(Site site, String message, this.trace)
        : super(site, '', '500 Oops', description: message);
  
    Future generateContent(Map<String, String> params) async {
  
negative.code: 
      buf.writeln('<div class="column one-half">');
      h3('Status');
      buf.writeln(writeOption('Server type', server.runtimeType));
      buf.writeln(writeOption('Instrumentation enabled',
          AnalysisEngine.instance.instrumentationService.isActive));
      bool uxExp1 =
  