Introduce the TYPEDEF element, and use it in order to catch passing closures to the DOM. I make the…

frog/leg/scanner/listener.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.
 
 final bool VERBOSE = false;
 
 class Listener {
   void beginArguments(Token token) {
   }
 
@@ skipping 555 matching lines @@
     NodeList supertypes =
         makeNodeList(supertypeCount, extendsKeyword, null, ",");
     Identifier name = popNode();
     pushElement(new PartialClassElement(
         name.source, interfaceKeyword, endToken, compilationUnitElement));
   }
 
   void endFunctionTypeAlias(Token typedefKeyword, Token endToken) {
     Identifier name = popNode();
     TypeAnnotation returnType = popNode();
+    pushElement(new TypedefElement(name.source, compilationUnitElement));
   }
 
   void handleVoidKeyword(Token token) {
     pushNode(new TypeAnnotation(new Identifier(token), null));
   }
 
   void endTopLevelMethod(Token beginToken, Token getOrSet, Token endToken) {
     Identifier name = popNode();
     Modifiers modifiers = popNode();
     ElementKind kind;
@@ skipping 869 matching lines @@
 
 Node parse(DiagnosticListener diagnosticListener,
            CompilationUnitElement element,
            doParse(Parser parser)) {
   NodeListener listener = new NodeListener(diagnosticListener, element);
   doParse(new Parser(listener));
   Node node = listener.popNode();
   assert(listener.nodes.isEmpty());
   return node;
 }