super is only allowed in methods, accessors and constructor

test/mjsunit/harmony/classes.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --harmony-classes --harmony-sloppy
 
 (function TestBasics() {
   var C = class C {}
   assertEquals(typeof C, 'function');
   assertEquals(C.__proto__, Function.prototype);
@@ skipping 856 matching lines @@
   new C2();
 
   class C3 extends Object {
     constructor() {
       ; 'use strict';;;;;
       // This is a comment.
       super();
     }
   };
   new C3();
-
-  class C4 extends Object {
-    constructor() {
-      super(new super());
-    }
-  }; new C4();
 }());