Handle map literals in conditional expression in PartialParser.skipExpression.

dart/tests/language/class_syntax2_test.dart

Index: dart/tests/language/class_syntax2_test.dart
diff --git a/dart/tests/language/class_syntax2_test.dart b/dart/tests/language/class_syntax2_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e884c23713bf13bc4b9e78a63208c3847ed9998f
--- /dev/null
+++ b/dart/tests/language/class_syntax2_test.dart
@@ -0,0 +1,28 @@
+// 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.
+
+// Regression test for dart2js bug http://dartbug.com/11570.
+
+import 'package:expect/expect.dart';
+
+void main() {
+  var c = new Cool(true);
+  Expect.stringEquals('{}', '${c.thing}');
+
+  c = new Cool(false);
+  Expect.stringEquals('[]', '${c.thing}');
+
+  c = new Cool.alt(true);
+  Expect.stringEquals('{}', '${c.thing}');
+
+  c = new Cool.alt(false);
+  Expect.stringEquals('[]', '${c.thing}');
+}
+
+class Cool {
+  final thing;
+
+  Cool(bool option) : thing = option ? <String, String>{} : <String>[];
+  Cool.alt(bool option) : thing = !option ? <String>[] : <String, String>{};
+}