Clean up handling of types.

lib/compiler/implementation/resolver.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.
 
 interface TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
   Type getType(TypeAnnotation annotation);
 }
 
@@ skipping 829 matching lines @@
       target = prefix.lookupLocalMember(name);
       if (target == null) {
         error(node, MessageKind.NO_SUCH_LIBRARY_MEMBER, [prefix.name, name]);
       }
     }
     return target;
   }
 
   Type resolveTypeTest(Node argument) {
     TypeAnnotation node = argument.asTypeAnnotation();
-    if (node == null) {
+    if (node === null) {
       // node is of the form !Type.
       node = argument.asSend().receiver.asTypeAnnotation();
       if (node === null) compiler.cancel("malformed send");
     }
     return resolveTypeRequired(node);
   }
 
   void handleArguments(Send node) {
     int count = 0;
     List<SourceString> namedArguments = <SourceString>[];
@@ skipping 193 matching lines @@
     return result;
   }
 
   Element resolveTypeName(node) {
     Identifier typeName = node.typeName.asIdentifier();
     Send send = node.typeName.asSend();
     if (send !== null) {
       typeName = send.selector;
     }
     if (typeName.source == Types.VOID) return compiler.types.voidType.element;
-    if (typeName.source == Types.DYNAMIC ||
-        typeName.source.stringValue == "var") {
-      return compiler.types.dynamicType.element;
-    }
     if (send !== null) {
       Element e = context.lookup(send.receiver.asIdentifier().source);
       if (e !== null && e.kind === ElementKind.PREFIX) {
         // The receiver is a prefix. Lookup in the imported members.
         PrefixElement prefix = e;
         return prefix.lookupLocalMember(typeName.source);
       } else if (e !== null && e.kind === ElementKind.CLASS) {
         // The receiver is the class part of a named constructor.
         return e;
       } else {
@@ skipping 841 matching lines @@
 
   TopScope(LibraryElement library) : super(null, library);
   Element lookup(SourceString name) {
     return library.find(name);
   }
 
   Element add(Element element) {
     throw "Cannot add an element in the top scope";
   }
 }