Fix rasta unittests: now unit tests need to run the full compiler to use its

tests/compiler/dart2js/kernel/visitor_test.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.
 
 /// Test that the dart2js copy of [KernelVisitor] generates the expected IR as
 /// defined by kernel spec-mode test files.
 
 import 'dart:io';
+import 'dart:async';
 import 'package:compiler/src/compiler.dart' show Compiler;
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/js_backend/backend.dart' show JavaScriptBackend;
 import 'package:compiler/src/commandline_options.dart' show Flags;
 import 'package:kernel/ast.dart';
 import 'package:kernel/text/ast_to_text.dart';
 import 'package:kernel/transformations/mixin_full_resolution.dart';
 import 'package:kernel/class_hierarchy.dart';
 import 'package:path/path.dart' as pathlib;
 import 'package:test/test.dart';
 
 import '../memory_compiler.dart';
 
 const String TESTCASE_DIR = 'pkg/kernel/testcases/';
 
 const List<String> SKIP_TESTS = const <String>[
   /// The test expects an unpatched api.
   'external',
 ];
 
-main(List<String> arguments) {
-  Compiler compiler = compilerFor(
-      options: [Flags.analyzeOnly, Flags.analyzeMain, Flags.useKernel]);
+main(List<String> arguments) async {
+
   Directory directory = new Directory('${TESTCASE_DIR}/input');
   for (FileSystemEntity file in directory.listSync()) {
     if (file is File && file.path.endsWith('.dart')) {
       String name = pathlib.basenameWithoutExtension(file.path);
       bool selected = arguments.contains(name);
       if (!selected) {
         if (arguments.isNotEmpty) continue;
         if (SKIP_TESTS.contains(name)) continue;
       }
 
       test(name, () async {
-        LibraryElement library = await compiler.analyzeUri(file.absolute.uri);
+        var compiler = await newCompiler();
+        await compiler.run(file.absolute.uri);
+        LibraryElement library =
+            await compiler.libraryLoader.loadLibrary(file.absolute.uri);
         JavaScriptBackend backend = compiler.backend;
         StringBuffer buffer = new StringBuffer();
         Program program = backend.kernelTask.buildProgram(library);
         new MixinFullResolution().transform(program);
         new Printer(buffer)
             .writeLibraryFile(program.mainMethod.enclosingLibrary);
         String actual = buffer.toString();
         String expected =
             new File('${TESTCASE_DIR}/spec-mode/$name.baseline.txt')
                 .readAsStringSync();
         if (selected) {
           String input =
               new File('${TESTCASE_DIR}/input/$name.dart').readAsStringSync();
           print('============================================================');
           print(name);
           print('--input-----------------------------------------------------');
           print(input);
           print('--expected--------------------------------------------------');
           print(expected);
           print('--actual----------------------------------------------------');
           print(actual);
         }
         expect(actual, equals(expected));
       });
     }
   }
 }
+
+Future<Compiler> newCompiler() async {
+  Compiler compiler = compilerFor(
+      options: [Flags.analyzeOnly, Flags.analyzeAll, Flags.useKernel]);
+  await compiler.setupSdk();
+
+  // The visitor no longer enqueues elements that are not reachable from the
+  // program. The mixin-full resolution transform run by the test expects to
+  // find dart.core::Iterator.
+  var core = await compiler.libraryLoader.loadLibrary(Uri.parse('dart:core'));
+  var cls = core.implementation.localLookup('Iterator');
+  cls.ensureResolved(compiler.resolution);
+  return compiler;
+}