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

tests/language/src/ConstructorReturnTest.dart

Index: tests/language/src/ConstructorReturnTest.dart
===================================================================
--- tests/language/src/ConstructorReturnTest.dart	(revision 0)
+++ tests/language/src/ConstructorReturnTest.dart	(revision 0)
@@ -0,0 +1,15 @@
+// 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 can only have return
+// statements in the form 'return;'.
+class A {
+  int x;
+  A(this.x) { return; } // 'return;' is equivalent to 'return this;'
+  int foo(int y) => x + y;
+}
+
+main() {
+  Expect.equals((new A(1)).foo(10), 11);
+}