Basic dart^2 analyzer tests running.

pkg/analyzer_experimental/lib/src/analyzer_impl.dart

 // Copyright (c) 2013, 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 analyzer_impl;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'generated/java_io.dart';
 import 'generated/engine.dart';
 import 'generated/error.dart';
 import 'generated/source_io.dart';
 import 'generated/sdk.dart';
 import 'generated/sdk_io.dart';
 import 'generated/ast.dart';
 import 'generated/element.dart';
 import '../options.dart';
 
+
+DartSdk sdk;
+
 /// Analyzes single library [File].
 class AnalyzerImpl {
   final CommandLineOptions options;
-  DartSdk sdk;
 
   ContentCache contentCache = new ContentCache();
   SourceFactory sourceFactory;
   AnalysisContext context;
 
   /// All [Source]s references by the analyzed library.
   final Set<Source> sources = new Set<Source>();
 
   /// All [AnalysisErrorInfo]s in the analyzed library.
   final List<AnalysisErrorInfo> errorInfos = new List<AnalysisErrorInfo>();
 
   AnalyzerImpl(CommandLineOptions this.options) {
-    sdk = new DirectoryBasedDartSdk(new JavaFile(options.dartSdkPath));
+    if (sdk == null) {
+      sdk = new DirectoryBasedDartSdk(new JavaFile(options.dartSdkPath));
+    }
   }
 
   /**
    * Treats the [sourcePath] as the top level library and analyzes it.
    */
   void analyze(String sourcePath) {
     sources.clear();
     errorInfos.clear();
     if (sourcePath == null) {
       throw new ArgumentError("sourcePath cannot be null");
@@ skipping 104 matching lines @@
       JavaFile packagesDir = new JavaFile.relative(dir, "packages");
       if (packagesDir.exists()) {
         return packagesDir;
       }
       dir = dir.getParentFile();
     }
     // not found
     return null;
   }
 }