Update class and interface cycle tests

tests/language/class_cycle2_test.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.
 // Check fail because of cycles in super class relationship.
 
-class C extends B {
+class C extends B {}
 
+class A extends B {}
+
+class B
+  extends A  /// 01: compile-time error
+  extends A  /// 02: compile-time error
+{}
+
+main() {
+  new C();  /// 01: continued
+  new List<C>();  /// 02: continued
 }
-
-class A extends B {
-
-}
-
-class B extends A {
-
-}
-
-class ClassCycleNegativeTest {
-  static testMain() {
-  }
-}
-main() {
-  ClassCycleNegativeTest.testMain();
-}