https://code.google.com/p/dart/issues/detail?id=225

tests/language/src/ConstructorReturnNegativeTest.dart

Index: tests/language/src/ConstructorReturnNegativeTest.dart
===================================================================
--- tests/language/src/ConstructorReturnNegativeTest.dart	(revision 0)
+++ tests/language/src/ConstructorReturnNegativeTest.dart	(revision 0)
@@ -0,0 +1,13 @@
+// Copyright (c) 2011, 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.
+
+// Dart spec 0.03, section 11.10 - generative constructors cannot have return
+// statements in the form 'return e;' where 'e' is any arbitrary expression.
+class A {
+  A() { return null; }
+}
+
+main() {
+  A a = new A();
+}