Extract ClosedWorldImpl from WorldImpl.

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 EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 60 matching lines @@
 import 'universe/world_builder.dart'
     show ResolutionWorldBuilder, CodegenWorldBuilder;
 import 'universe/use.dart' show StaticUse, TypeUse;
 import 'universe/world_impact.dart'
     show
         ImpactStrategy,
         WorldImpact,
         WorldImpactBuilder,
         WorldImpactBuilderImpl;
 import 'util/util.dart' show Link, Setlet;
-import 'world.dart' show ClosedWorld, ClosedWorldRefiner, WorldImpl;
+import 'world.dart' show ClosedWorld, ClosedWorldRefiner, ClosedWorldImpl;
 
-typedef Backend MakeBackendFuncion(Compiler compiler);
+typedef Backend MakeBackendFunction(Compiler compiler);
 
 typedef CompilerDiagnosticReporter MakeReporterFunction(
     Compiler compiler, CompilerOptions options);
 
 abstract class Compiler implements LibraryLoaderListener {
   Measurer get measurer;
 
   final IdGenerator idGenerator = new IdGenerator();
   Types types;
   _CompilerCoreTypes _coreTypes;
@@ skipping 96 matching lines @@
   static const int PHASE_DONE_RESOLVING = 2;
   static const int PHASE_COMPILING = 3;
   int phase;
 
   bool compilationFailed = false;
 
   Compiler(
       {CompilerOptions options,
       api.CompilerOutput outputProvider,
       this.environment: const _EmptyEnvironment(),
-      MakeBackendFuncion makeBackend,
+      MakeBackendFunction makeBackend,
       MakeReporterFunction makeReporter})
       : this.options = options,
         this.cacheStrategy = new CacheStrategy(options.hasIncrementalSupport),
         this.userOutputProvider = outputProvider == null
             ? const NullCompilerOutput()
             : outputProvider {
     if (makeReporter != null) {
       _reporter = makeReporter(this, options);
     } else {
       _reporter = new CompilerDiagnosticReporter(this, options);
@@ skipping 519 matching lines @@
 
         backend.onCodegenEnd();
 
         checkQueues();
       });
 
   /// Perform the steps needed to fully end the resolution phase.
   ClosedWorldRefiner closeResolution() {
     phase = PHASE_DONE_RESOLVING;
 
-    WorldImpl world = resolverWorld.openWorld.closeWorld(reporter);
+    ClosedWorldImpl world = resolverWorld.openWorld.closeWorld(reporter);
     // Compute whole-program-knowledge that the backend needs. (This might
     // require the information computed in [world.closeWorld].)
     backend.onResolutionComplete(world, world);
 
     deferredLoadTask.onResolutionComplete(mainFunction);
 
     // TODO(johnniwinther): Move this after rti computation but before
     // reflection members computation, and (re-)close the world afterwards.
     closureToClassMapper.createClosureClasses(world);
     return world;
@@ skipping 1469 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;
 }