Use the typedef arity to know how to invoke a closure given by the dom.

dart/lib/compiler/implementation/elements/elements.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.
 
 #library('elements');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
 #import('../leg.dart');  // TODO(karlklose): we only need type.
 #import('../util/util.dart');
@@ skipping 338 matching lines @@
   lookupLocalMember(SourceString memberName) => imported[memberName];
 
   Type computeType(Compiler compiler) => compiler.types.dynamicType;
 
   Token position() => firstPosition;
 }
 
 class TypedefElement extends Element {
   final Token token;
   Type cachedType;
+  Node cachedNode;

[ahe, 2012/05/29 12:32:08]

The type should be Typedef.

[ngeoffray, 2012/05/29 13:06:28]

Done.

 
   TypedefElement(SourceString name, Element enclosing, this.token)
       : super(name, ElementKind.TYPEDEF, enclosing) {
     cachedType = new InterfaceType(this);
   }
 
+  Node parseNode(Compiler compiler) {

[ahe, 2012/05/29 12:32:08]

I would prefer if this followed the "PartialFunctionElement" approach and kept
the parseNode method in the parser, that is, scanner/listener.dart.

[ngeoffray, 2012/05/29 13:06:28]

Done.

+    if (cachedNode !== null) return cachedNode;
+    NodeListener listener = new NodeListener(compiler, enclosingElement);
+    Parser parser = new Parser(listener);
+    Token token = parser.parseTopLevelDeclaration(token);
+    cachedNode = listener.popNode();
+    assert(listener.nodes.isEmpty());

[kasperl, 2012/05/29 12:16:24]

Maybe cancel with an internal error instead?

[ahe, 2012/05/29 12:32:08]

This is consistent with other code.

+    return cachedNode;
+  }
+
   position() => findMyName(token);
 
   Type computeType(Compiler compiler) => cachedType;
 }
 
 class VariableElement extends Element {
   final VariableListElement variables;
   Expression cachedNode; // The send or the identifier in the variables list.
 
   Modifiers get modifiers() => variables.modifiers;
@@ skipping 671 matching lines @@
   final Node node;
   Type bound;
   Type type;
   TypeVariableElement(name, Element enclosing, this.node, this.type,
                       [this.bound])
     : super(name, ElementKind.TYPE_VARIABLE, enclosing);
   Type computeType(compiler) => type;
   Node parseNode(compiler) => node;
   toString() => "${enclosingElement.toString()}.${name.slowToString()}";
 }