Don't resolve symlinks on Windows to find the SDK.

lib/src/util/io.dart

 // Copyright (c) 2015, 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 test.util.io;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:mirrors';
 
 import 'package:path/path.dart' as p;
 import 'package:pub_semver/pub_semver.dart';
 
 import '../backend/operating_system.dart';
 import '../runner/application_exception.dart';
 
 /// The ASCII code for a newline character.
 const _newline = 0xA;
 
 /// The ASCII code for a carriage return character.
 const _carriageReturn = 0xD;
 
 /// The root directory of the Dart SDK.
 final String sdkDir = (() {
   // TODO(kevmoo): work-around for accessing the SDK root dartbug.com/16994
-  var path = new File(Platform.executable).resolveSymbolicLinksSync();
+  //
+  // Don't resolve symlinks on Windows because of issue 133. Once the TODO above
+  // is resolved, we won't have to do explicit symlink resolution anyway.
+  var path = Platform.isWindows
+      ? Platform.executable
+      : new File(Platform.executable).resolveSymbolicLinksSync();
   return p.dirname(p.dirname(path));
 })();
 
 /// The version of the Dart SDK currently in use.
 final Version _sdkVersion = new Version.parse(
     new File(p.join(sdkDir, 'version'))
         .readAsStringSync().trim());
 
 /// Returns the current operating system.
 final OperatingSystem currentOS = (() {
@@ skipping 119 matching lines @@
 /// returned.
 String libraryPath(Symbol libraryName, {String packageRoot}) {
   var lib = currentMirrorSystem().findLibrary(libraryName);
   if (lib.uri.scheme != 'package') return p.fromUri(lib.uri);
 
   // TODO(nweiz): is there a way to avoid assuming this is being run next to a
   // packages directory?.
   if (packageRoot == null) packageRoot = p.absolute('packages');
   return p.join(packageRoot, p.fromUri(lib.uri.path));
 }