Do not add forwarding constructors to a pricate constructor from a different library.

sdk/lib/_internal/compiler/implementation/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 {
   Element get currentElement;
   Setlet<Node> get superUses;
 
@@ skipping 4303 matching lines @@
 
     assert(mixinApplication.mixinType == null);
     mixinApplication.mixinType = resolveMixinFor(mixinApplication, mixinType);
 
     // Create forwarding constructors for constructor defined in the superclass
     // because they are now hidden by the mixin application.
     superclass.forEachLocalMember((Element member) {
       if (!member.isGenerativeConstructor) return;
       FunctionElement forwarder =
           createForwardingConstructor(member, mixinApplication);
+      if (isPrivateName(member.name) &&
+          mixinApplication.library != superclass.library) {
+        // Do not create a forwarder to the super constructor, because the mixin
+        // application is in a different library than the constructor in the
+        // super class and it is not possible to call that constructor from the
+        // library using the mixin application.
+        return;
+      }
       mixinApplication.addConstructor(forwarder);
     });
     calculateAllSupertypes(mixinApplication);
   }
 
   InterfaceType resolveMixinFor(MixinApplicationElement mixinApplication,
                                 DartType mixinType) {
     ClassElement mixin = mixinType.element;
     mixin.ensureResolved(compiler);
 
@@ skipping 535 matching lines @@
 }
 
 /// The result for the resolution of the `assert` method.
 class AssertResult implements ResolutionResult {
   const AssertResult();
 
   Element get element => null;
 
   String toString() => 'AssertResult()';
 }