Ensure we're looking at the correct resolved AST when initializing fields in constructors.

pkg/compiler/lib/src/resolved_uri_translator.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.
 
 import 'common.dart';
 import 'elements/elements.dart' show LibraryElement;
 import 'util/emptyset.dart';
 
 /// API used by the library loader to translate internal SDK URIs into file
 /// system readable URIs.
@@ skipping 97 matching lines @@
     if (location == null) {
       _reporter.reportErrorMessage(spannable, MessageKind.LIBRARY_NOT_FOUND,
           {'resolvedUri': resolvedUri});
       return null;
     }
 
     if (resolvedUri.path.startsWith('_')) {
       bool allowInternalLibraryAccess = importingLibrary != null &&
           (importingLibrary.isPlatformLibrary ||
               importingLibrary.isPatch ||
+              importingLibrary.canonicalUri.scheme == 'memory' ||

[Siggi Cherem (dart-lang), 2017/01/05 23:23:31]

let's add a comment that this is for unit tests that use the in-memory compiler

[Emily Fortuna, 2017/01/06 00:19:25]

Done.

               importingLibrary.canonicalUri.path
                   .contains('sdk/tests/compiler/dart2js_native'));
 
       if (!allowInternalLibraryAccess) {
         if (importingLibrary != null) {
           _reporter.reportErrorMessage(
               spannable, MessageKind.INTERNAL_LIBRARY_FROM, {
             'resolvedUri': resolvedUri,
             'importingUri': importingLibrary.canonicalUri
           });
@@ skipping 22 matching lines @@
   }
 
   void registerDisallowedLibraryUse(Uri uri) {
     disallowedLibraryUris.add(uri);
   }
 
   Uri lookupLibraryUri(String libraryName) {
     return _sdkLibraries[libraryName];
   }
 }