Handle redirects to unresolved redirects

pkg/compiler/lib/src/serialization/modelz.dart

 // Copyright (c) 2015, 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.
 
 /// Implementation of the element model used for deserialiation.
 ///
 /// These classes are created by [ElementDeserializer] triggered by the
 /// [Deserializer].
 
 library dart2js.serialization.modelz;
@@ skipping 1280 matching lines @@
 }
 
 class FactoryConstructorElementZ extends ConstructorElementZ {
   FactoryConstructorElementZ(ObjectDecoder decoder) : super(decoder);
 
   @override
   ElementKind get kind => ElementKind.FACTORY_CONSTRUCTOR;
 }
 
 class RedirectingFactoryConstructorElementZ extends ConstructorElementZ {
-  InterfaceType _effectiveTargetType;
+  DartType _effectiveTargetType;
   ConstructorElement _immediateRedirectionTarget;
   PrefixElement _redirectionDeferredPrefix;
+  bool _effectiveTargetIsMalformed;
 
   RedirectingFactoryConstructorElementZ(ObjectDecoder decoder) : super(decoder);
 
   @override
   ElementKind get kind => ElementKind.FACTORY_CONSTRUCTOR;
 
   @override
   bool get isRedirectingFactory => true;
 
   void _ensureEffectiveTarget() {
     if (_effectiveTarget == null) {
       _effectiveTarget =
           _decoder.getElement(Key.EFFECTIVE_TARGET, isOptional: true);
       if (_effectiveTarget == null) {
         _effectiveTarget = this;
         _effectiveTargetType = enclosingClass.thisType;
+        _effectiveTargetIsMalformed = false;
       } else {
         _effectiveTargetType = _decoder.getType(Key.EFFECTIVE_TARGET_TYPE);
+        _effectiveTargetIsMalformed =
+            _decoder.getBool(Key.EFFECTIVE_TARGET_IS_MALFORMED);
       }
     }
   }
 
+  bool get isEffectiveTargetMalformed {
+    _ensureEffectiveTarget();
+    return _effectiveTargetIsMalformed;
+  }
+
   @override
   ConstructorElement get effectiveTarget {
     _ensureEffectiveTarget();
     return _effectiveTarget;
   }
 
   @override
-  InterfaceType computeEffectiveTargetType(InterfaceType newType) {
+  DartType computeEffectiveTargetType(InterfaceType newType) {
     _ensureEffectiveTarget();
     return _effectiveTargetType.substByContext(newType);
   }
 
   void _ensureRedirection() {
     if (_immediateRedirectionTarget == null) {
       _immediateRedirectionTarget =
           _decoder.getElement(Key.IMMEDIATE_REDIRECTION_TARGET);
       _redirectionDeferredPrefix =
           _decoder.getElement(Key.PREFIX, isOptional: true);
@@ skipping 983 matching lines @@
   }
 
   @override
   Node get node => throw new UnsupportedError('${this}.node');
 
   @override
   bool get hasNode => false;
 
   String toString() => 'MetadataAnnotationZ(${constant.toDartText()})';
 }