Named arguments printed correctly by Dartdoc

pkg/dartdoc/lib/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 1379 matching lines @@
     writeln('</div>');
 
     writeln('</div>');
   }
 
   void docParamList(ContainerMirror enclosingType,
                     List<ParameterMirror> parameters) {
     write('(');
     bool first = true;
     bool inOptionals = false;
+    bool isNamed = false;
     for (final parameter in parameters) {
       if (!first) write(', ');
 
       if (!inOptionals && parameter.isOptional) {
-        write('[');
+        isNamed = parameter.isNamed;
+        write(isNamed ? '{' : '[');
         inOptionals = true;
       }
 
       annotateType(enclosingType, parameter.type, parameter.simpleName);
 
       // Show the default value for named optional parameters.
       if (parameter.isOptional && parameter.hasDefaultValue) {
-        write(' = ');
+        write(isNamed ? ': ' : ' = ');
         write(parameter.defaultValue);
       }
 
       first = false;
     }
 
-    if (inOptionals) write(']');
+    if (inOptionals) {
+      write(isNamed ? '}' : ']');
+    }
     write(')');
   }
 
   void docComment(ContainerMirror host, DocComment comment) {
     if (comment != null) {
       if (comment.inheritedFrom != null) {
         writeln('<div class="inherited">');
         writeln(comment.html);
         write('<div class="docs-inherited-from">docs inherited from ');
         annotateType(host, comment.inheritedFrom);
@@ skipping 426 matching lines @@
   final ClassMirror inheritedFrom;
 
   DocComment(this.text, [this.inheritedFrom = null]) {
     assert(text != null && !text.trim().isEmpty);
   }
 
   String get html => md.markdownToHtml(text);
 
   String toString() => text;
 }