Add named constructor name checking

pkg/dartdoc/ast.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.
 
 /// Base class for any AST item. Roughly corresponds to Node in the DOM. Will
 /// be either an Element or Text.
 interface Node {
   void accept(NodeVisitor visitor);
 }
 
 /// A named tag that can contain other nodes.
 class Element implements Node {
   final String tag;
   final List<Node> children;
   final Map<String, String> attributes;
 
   Element(this.tag, this.children)
     : attributes = <String, String>{};
 
   Element.empty(this.tag)
     : children = null,
       attributes = <String, String>{};
 
-  Element.tag(this.tag)
+  Element.withTag(this.tag)
     : children = [],
       attributes = <String, String>{};
 
   Element.text(this.tag, String text)
     : children = [new Text(text)],
       attributes = <String, String>{};
 
   bool get isEmpty() => children == null;
 
   void accept(NodeVisitor visitor) {
@@ skipping 19 matching lines @@
   void visitText(Text text);
 
   /// Called when an Element has been reached, before its children have been
   /// visited. Return `false` to skip its children.
   bool visitElementBefore(Element element);
 
   /// Called when an Element has been reached, after its children have been
   /// visited. Will not be called if [visitElementBefore] returns `false`.
   void visitElementAfter(Element element);
 }