First implementation of top-level fields without initializers.

frog/leg/resolver.dart

 // Copyright (c) 2011, 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.
 
 class TreeElements {
   Map<Node, Element> map;
   TreeElements() : map = new LinkedHashMap<Node, Element>();
   operator []=(Node node, Element element) => map[node] = element;
   operator [](Node node) => map[node];
 }
@@ skipping 457 matching lines @@
 
   visitNode(Node node) {
     compiler.cancel('internal error');
   }
 }
 
 class VariableDefinitionsVisitor extends AbstractVisitor<SourceString> {
   VariableDefinitions definitions;
   ResolverVisitor resolver;
   ElementKind kind;
+  VariableListElement variables;
 
-  VariableDefinitionsVisitor(this.definitions, this.resolver, this.kind);
+  VariableDefinitionsVisitor(this.definitions, this.resolver, this.kind) {
+    variables = new VariableListElement.node(
+        definitions, ElementKind.VARIABLE_LIST, resolver.context.element);
+  }
 
   SourceString visitSendSet(SendSet node) {
     assert(node.arguments.tail.isEmpty()); // Sanity check
     if (node.receiver !== null) {
       resolver.cancel(node,
           "receiver on a variable definition not implemented");
     }
     Identifier selector = node.selector;
     resolver.visit(node.arguments.head);
 
     return visit(node.selector);
   }
 
   SourceString visitIdentifier(Identifier node) => node.source;
 
   visitNodeList(NodeList node) {
     for (Link<Node> link = node.nodes; !link.isEmpty(); link = link.tail) {
       SourceString name = visit(link.head);
-      Element element = new VariableElement(link.head, definitions.type,
-          kind, name, resolver.context.element);
+      Element element = new VariableElement(
+          name, variables, kind, resolver.context.element);
       resolver.defineElement(link.head, element);
     }
   }
 
   visit(Node node) => node.accept(this);
 }
 
 class ParametersVisitor extends AbstractVisitor<Element> {
   ResolverVisitor resolver;
   LinkBuilder<Element> elements;
@@ skipping 72 matching lines @@
 class TopScope extends Scope {
   Universe universe;
 
   TopScope(Universe this.universe) : super(null, null);
   Element lookup(SourceString name) => universe.find(name);
 
   Element add(Element element) {
     throw "Cannot add an element in the top scope";
   }
 }