Big merge from experimental to bleeding edge.

sdk/lib/_internal/compiler/implementation/dart_backend/backend.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.
 
 part of dart_backend;
 
 // TODO(ahe): This class is simply wrong.  This backend should use
 // elements when it can, not AST nodes.  Perhaps a [Map<Element,
 // TreeElements>] is what is needed.
 class ElementAst {
@@ skipping 119 matching lines @@
    * 2) The code has typedefs in right hand side of IS checks,
    * 3) The code has classes which extend typedefs, have type arguments typedefs
    *    or type variable bounds typedefs.
    * These restrictions can be less strict.
    */
   bool isSafeToRemoveTypeDeclarations(
       Map<ClassElement, Set<Element>> classMembers) {
     Set<DartType> processedTypes = new Set<DartType>();
     List<DartType> workQueue = new List<DartType>();
     workQueue.addAll(
-        classMembers.keys.map((classElement) => classElement.thisType));
+        classMembers.keys.mappedBy((classElement) => classElement.thisType));
     workQueue.addAll(compiler.resolverWorld.isChecks);
     Element typeErrorElement =
         compiler.coreLibrary.find(new SourceString('TypeError'));
     DartType typeErrorType = typeErrorElement.computeType(compiler);
     if (workQueue.indexOf(typeErrorType) != -1) {
       return false;
     }
 
     void processTypeArguments(Element classElement, NodeList typeArguments) {
       if (typeArguments == null) return;
@@ skipping 52 matching lines @@
       'Map', 'List', 'num', 'int', 'double', 'bool'
     ];
     final coreLibrary = compiler.coreLibrary;
     for (final name in LITERAL_TYPE_NAMES) {
       ClassElement classElement = coreLibrary.findLocal(new SourceString(name));
       classElement.ensureResolved(compiler);
     }
   }
   void codegen(WorkItem work) { }
   void processNativeClasses(Enqueuer world,
-                            Collection<LibraryElement> libraries) { }
+                            Iterable<LibraryElement> libraries) { }
 
   bool isUserLibrary(LibraryElement lib) {
     final INTERNAL_HELPERS = [
       compiler.jsHelperLibrary,
       compiler.interceptorsLibrary,
     ];
     return INTERNAL_HELPERS.indexOf(lib) == -1 && !lib.isPlatformLibrary;
   }
 
   void assembleProgram() {
@@ skipping 220 matching lines @@
     final unparser = new EmitterUnparser(renames);
     emitCode(unparser, imports, topLevelNodes, memberNodes);
     compiler.assembledCode = unparser.result;
 
     // Output verbose info about size ratio of resulting bundle to all
     // referenced non-platform sources.
     logResultBundleSizeInfo(topLevelElements);
   }
 
   void logResultBundleSizeInfo(Set<Element> topLevelElements) {
-    Collection<LibraryElement> referencedLibraries =
-        compiler.libraries.values.filter(isUserLibrary);
+    Iterable<LibraryElement> referencedLibraries =
+        compiler.libraries.values.where(isUserLibrary);
     // Sum total size of scripts in each referenced library.
     int nonPlatformSize = 0;
     for (LibraryElement lib in referencedLibraries) {
       for (CompilationUnitElement compilationUnit in lib.compilationUnits) {
         nonPlatformSize += compilationUnit.script.text.length;
       }
     }
     int percentage = compiler.assembledCode.length * 100 ~/ nonPlatformSize;
     log('Total used non-platform files size: ${nonPlatformSize} bytes, '
         'bundle size: ${compiler.assembledCode.length} bytes (${percentage}%)');
@@ skipping 88 matching lines @@
   result.sort(comparison);
   return result;
 }
 
 compareElements(e0, e1) {
   int result = compareBy((e) => e.getLibrary().uri.toString())(e0, e1);
   if (result != 0) return result;
   return compareBy((e) => e.position().charOffset)(e0, e1);
 }
 
-List<Element> sortElements(Collection<Element> elements) =>
+List<Element> sortElements(Iterable<Element> elements) =>
     sorted(elements, compareElements);