Checked mode fixes.

dart/pkg/compiler/lib/src/scanner/class_element_parser.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.
 
 part of scanner;
 
 class ClassElementParser extends PartialParser {
   ClassElementParser(Listener listener) : super(listener);
 
   Token parseClassBody(Token token) => fullParseClassBody(token);
 }
 
 class PartialClassElement extends ClassElementX with PartialElement {
   ClassNode cachedNode;
 
   PartialClassElement(String name,
                       Token beginToken,
                       Token endToken,
                       Element enclosing,
                       int id)
       : super(name, enclosing, id, STATE_NOT_STARTED) {
     this.beginToken = beginToken;
     this.endToken = endToken;
   }
 
   void set supertypeLoadState(int state) {
-    assert(state == supertypeLoadState + 1);
+    assert(state == STATE_NOT_STARTED || state == supertypeLoadState + 1);
     assert(state <= STATE_DONE);
     super.supertypeLoadState = state;
   }
 
   void set resolutionState(int state) {
-    assert(state == resolutionState + 1);
+    assert(state == STATE_NOT_STARTED || state == resolutionState + 1);
     assert(state <= STATE_DONE);
     super.resolutionState = state;
   }
 
   bool get hasNode => cachedNode != null;
 
   ClassNode get node {
     assert(invariant(this, cachedNode != null,
         message: "Node has not been computed for $this."));
     return cachedNode;
@@ skipping 173 matching lines @@
 
   void endMetadata(Token beginToken, Token periodBeforeName, Token endToken) {
     popNode(); // Discard arguments.
     if (periodBeforeName != null) {
       popNode(); // Discard name.
     }
     popNode(); // Discard node (Send or Identifier).
     pushMetadata(new PartialMetadataAnnotation(beginToken, endToken));
   }
 }