Fix accessing dart:_ libraries via exports.

runtime/vm/parser.cc

 // 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.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "platform/utils.h"
 #include "vm/ast_transformer.h"
 #include "vm/bootstrap.h"
@@ skipping 5757 matching lines @@
     library.SetLoadRequested();
     CallLibraryTagHandler(Dart_kImportTag, import_pos, canon_url);
   }
 
   Namespace& ns = Namespace::Handle(Z,
       Namespace::New(library, show_names, hide_names));
   if (metadata_pos >= 0) {
     ns.AddMetadata(metadata_pos, current_class());
   }
 
+  // Ensure that private dart:_ libraries are only imported into dart:
+  // libraries, including indirectly through exports.
+  const String& lib_url = String::Handle(Z, library_.url());
+  if (canon_url.StartsWith(Symbols::DartSchemePrivate()) &&
+      !lib_url.StartsWith(Symbols::DartScheme())) {
+    ReportError(import_pos, "private library is not accessible");
+  }
+
   if (is_import) {
-    // Ensure that private dart:_ libraries are only imported into dart:
-    // libraries.
-    const String& lib_url = String::Handle(Z, library_.url());
-    if (canon_url.StartsWith(Symbols::DartSchemePrivate()) &&
-        !lib_url.StartsWith(Symbols::DartScheme())) {
-      ReportError(import_pos, "private library is not accessible");
-    }
     if (prefix.IsNull() || (prefix.Length() == 0)) {
       ASSERT(!is_deferred_import);
       library_.AddImport(ns);
     } else {
       LibraryPrefix& library_prefix = LibraryPrefix::Handle(Z);
       library_prefix = library_.LookupLocalLibraryPrefix(prefix);
       if (!library_prefix.IsNull()) {
         // Check that prefix names of deferred import clauses are
         // unique.
         if (!is_deferred_import && library_prefix.is_deferred_load()) {
@@ skipping 7680 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart