Add a test for non-parameterized factory.

tests/language/src/NonParameterizedFactoryTest.dart

+// 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.
+
+interface Interface<T> factory Factory {
+  Interface();
+  Interface.withArg(T value);
+}
+
+class Factory {
+  factory Interface() {

[ahe, 2011/10/25 13:19:11]

Interface<T>

[ngeoffray, 2011/10/25 13:33:08]

Adding those make the VM complain instead of crash. I have created another test
case.

+    return null;
+  }
+
+  factory Interface.withArg(value) {

[ahe, 2011/10/25 13:19:11]

Interface<T>

+    return null;
+  }
+}
+
+main() {
+  new Interface();
+  new Interface<int>();
+  new Interface.withArg(4);
+  new Interface<int>.withArg(4);
+}