Add negative test for setters in initializer list.

tests/language/src/ConstructorSetterNegativeTest.dart

Index: tests/language/src/ConstructorSetterNegativeTest.dart
diff --git a/tests/language/src/ConstructorSetterNegativeTest.dart b/tests/language/src/ConstructorSetterNegativeTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1f73e7f669fb1e4fbf0ed0d721c6ca0e1de1994e
--- /dev/null
+++ b/tests/language/src/ConstructorSetterNegativeTest.dart
@@ -0,0 +1,14 @@
+// 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.
+// Test that setters are not invokable in the initializer list.
+
+class A {
+  A() : a = 499;  // <==== Error here.
+
+  set a(val){}
+}
+
+main() {
+  new A();
+}