Implement library access restrictions and privacy.

pkg/front_end/lib/src/fasta/builder/constructor_reference_builder.dart

 // Copyright (c) 2016, 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.
 
 library fasta.constructor_reference_builder;
 
 import 'builder.dart'
-    show Builder, ClassBuilder, PrefixBuilder, Scope, TypeBuilder;
+    show
+        Builder,
+        ClassBuilder,
+        LibraryBuilder,
+        PrefixBuilder,
+        Scope,
+        TypeBuilder;
 
 import '../messages.dart' show warning;
 
 class ConstructorReferenceBuilder extends Builder {
   final String name;
 
   final List<TypeBuilder> typeArguments;
 
   /// This is the name of a named constructor. As `bar` in `new Foo<T>.bar()`.
   final String suffix;
 
   Builder target;
 
   ConstructorReferenceBuilder(this.name, this.typeArguments, this.suffix,
       Builder parent, int charOffset)
       : super(parent, charOffset, parent.fileUri);
 
   String get fullNameForErrors => "$name${suffix == null ? '' : '.$suffix'}";
 
-  void resolveIn(Scope scope) {
+  void resolveIn(Scope scope, LibraryBuilder accessingLibrary) {
     int index = name.indexOf(".");
     Builder builder;
     if (index == -1) {
       builder = scope.lookup(name, charOffset, fileUri);
     } else {
       String prefix = name.substring(0, index);
       String middle = name.substring(index + 1);
       builder = scope.lookup(prefix, charOffset, fileUri);
       if (builder is PrefixBuilder) {
         PrefixBuilder prefix = builder;
         builder = prefix.lookup(middle, charOffset, fileUri);
       } else if (builder is ClassBuilder) {
         ClassBuilder cls = builder;
-        builder = cls.findConstructorOrFactory(middle, charOffset, fileUri);
+        builder = cls.findConstructorOrFactory(
+            middle, charOffset, fileUri, accessingLibrary);
         if (suffix == null) {
           target = builder;
           return;
         }
       }
     }
     if (builder is ClassBuilder) {
-      target =
-          builder.findConstructorOrFactory(suffix ?? "", charOffset, fileUri);
+      target = builder.findConstructorOrFactory(
+          suffix ?? "", charOffset, fileUri, accessingLibrary);
     }
     if (target == null) {
       warning(fileUri, charOffset,
           "Couldn't find constructor '$fullNameForErrors'.");
     }
   }
 }