Insert the right checks for redirecting factories to deferred constructors.

pkg/compiler/lib/src/resolution/members.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.
 
 part of resolution;
 
 abstract class TreeElements {
   AnalyzableElement get analyzedElement;
   Iterable<Node> get superUses;
 
@@ skipping 3209 matching lines @@
       compiler.reportError(
           node, MessageKind.FACTORY_REDIRECTION_IN_NON_FACTORY);
       compiler.reportHint(
           enclosingElement, MessageKind.MISSING_FACTORY_KEYWORD);
     }
     ConstructorElementX constructor = enclosingElement;
     bool isConstConstructor = constructor.isConst;
     ConstructorElement redirectionTarget = resolveRedirectingFactory(
         node, inConstContext: isConstConstructor);
     constructor.immediateRedirectionTarget = redirectionTarget;
+
+    Node constructorReference = node.constructorReference;
+    if (constructorReference is Send) {
+      constructor.redirectionDeferredPrefix =
+          compiler.deferredLoadTask.deferredPrefixElement(constructorReference,
+                                                          registry.mapping);
+    }
+
     registry.setRedirectingTargetConstructor(node, redirectionTarget);
     if (Elements.isUnresolved(redirectionTarget)) {
       registry.registerThrowNoSuchMethod();
       return;
     } else {
       if (isConstConstructor &&
           !redirectionTarget.isConst) {
         compiler.reportError(node, MessageKind.CONSTRUCTOR_IS_NOT_CONST);
       }
       if (redirectionTarget == constructor) {
@@ skipping 1908 matching lines @@
 }
 
 /// The result for the resolution of the `assert` method.
 class AssertResult implements ResolutionResult {
   const AssertResult();
 
   Element get element => null;
 
   String toString() => 'AssertResult()';
 }