anchor.diff:  
     // Generate rule files
     rules.forEach((l) => new Generator(l).generate(outDir));
  +
  +  // Generate options samples.
  +  new OptionsSample(rules).generate(outDir);
   }
   
   const ruleFootMatter = '''
  
positive.code:     .map((r) => '${toDescription(r)}')
      .join('\n\n');
  
  void printUsage(ArgParser parser, [String error]) {
    var message = 'Generates lint docs.';
    if (error != null) {
  
negative.code:             <h2 id="styleguide-rules">Pub Rules</h2>
  
                 $enumeratePubRules
  
           </section>
        </div>
        <footer>
  