Add closure_test

pkg/compiler/lib/src/compiler.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.
 
 library dart2js.compiler_base;
 
 import 'dart:async' show Future;
 
 import '../compiler_new.dart' as api;
 import 'backend_strategy.dart';
@@ skipping 99 matching lines @@
 
   /// Output provider from user of Compiler API.
   api.CompilerOutput userOutputProvider;
 
   List<Uri> librariesToAnalyzeWhenRun;
 
   ResolvedUriTranslator get resolvedUriTranslator;
 
   Uri mainLibraryUri;
 
+  ClosedWorld backendClosedWorldForTesting;
+
   DiagnosticReporter get reporter => _reporter;
   Resolution get resolution => _resolution;
   ParsingContext get parsingContext => _parsingContext;
 
   // TODO(zarah): Remove this map and incorporate compile-time errors
   // in the model.
   /// Tracks elements with compile-time errors.
   final Map<Entity, List<DiagnosticMessage>> elementsWithCompileTimeErrors =
       new Map<Entity, List<DiagnosticMessage>>();
 
@@ skipping 463 matching lines @@
                   '', 'data', api.OutputType.serializationData),
               libraryLoader.libraries.where((LibraryEntity library) {
             return !serialization.isDeserialized(library);
           }));
         }
         if (options.analyzeOnly) return;
         assert(mainFunction != null);
 
         ClosedWorldRefiner closedWorldRefiner = closeResolution(mainFunction);
         ClosedWorld closedWorld = closedWorldRefiner.closedWorld;
+        backendClosedWorldForTesting = closedWorld;
         mainFunction = closedWorld.elementEnvironment.mainFunction;
 
         reporter.log('Inferring types...');
         globalInference.runGlobalTypeInference(
             mainFunction, closedWorld, closedWorldRefiner);
 
         if (stopAfterTypeInference) return;
 
         backend.onTypeInferenceComplete(globalInference.results);
 
@@ skipping 981 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }