Constructors are handled correct in dartdoc.

pkg/dartdoc/bin/dartdoc.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * To generate docs for a library, run this script with the path to an
  * entrypoint .dart file, like:
  *
  *     $ dart dartdoc.dart foo.dart
  *
@@ skipping 80 matching lines @@
       defaultsTo: false, negatable: false,
       callback: (incApi) => dartdoc.includeApi = incApi);
 
   argParser.addFlag('link-api',
       help: 'Link to the online language API in the generated\n'
         'documentation. The option overrides inclusion\n'
         'through --include-api or --include-lib.',
       defaultsTo: false, negatable: false,
       callback: (linkApi) => dartdoc.linkToApi = linkApi);
 
+  argParser.addFlag('show-private',
+      help: 'Document private types and members.',
+      defaultsTo: false,
+      callback: (showPrivate) => dartdoc.showPrivate = showPrivate);
+
+  argParser.addFlag('inherit-from-object',
+      help: 'Show members inherited from Object.',
+      defaultsTo: false, negatable: false,
+      callback: (inherit) => dartdoc.inheritFromObject = inherit);
+
   argParser.addFlag('enable-diagnostic-colors', negatable: false);
 
   argParser.addOption('out',
       help: 'Generates files into directory specified. If\n'
         'omitted the files are generated into ./docs/',
       callback: (outDir) {
         if(outDir != null) {
           dartdoc.outputDir = new Path.fromNative(outDir);
         }
       });
@@ skipping 80 matching lines @@
   Future compiled = compileScript(dartdoc.mode, dartdoc.outputDir, libPath);
   Future filesCopied = copyDirectory(scriptDir.append('../static'),
                                      dartdoc.outputDir);
 
   Futures.wait([compiled, filesCopied]).then((_) {
     dartdoc.cleanup();
     print('Documented ${dartdoc.totalLibraries} libraries, '
           '${dartdoc.totalTypes} types, and ${dartdoc.totalMembers} members.');
   });
 }