Classes: Add basic support for properties

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
 
 (function TestBasics() {
   var C = class C {}
   assertEquals(typeof C, 'function');
   assertEquals(C.__proto__, Function.prototype);
@@ skipping 227 matching lines @@
   assertEquals(1, x);
   assertEquals(2, C.staticX = 2);
   assertEquals(2, staticX);
   assertEquals(3, new C().y = 3);
   assertEquals(3, y);
   assertEquals(4, C.staticY = 4);
   assertEquals(4, staticY);
 })();
 
 
+(function TestSideEffectsInPropertyDefine() {
+  function B() {}
+  B.prototype = {
+    constructor: B,
+    set m(v) {
+      throw Error();
+    }
+  };
+
+  class C extends B {
+    m() { return 1; }
+  }
+
+  assertEquals(1, new C().m());
+})();
+
+
 (function TestAccessors() {
   class C {
     // constructor(x) {
     //   this._x = x;
     // }
 
     get x() { return this._x; }
     set x(v) { this._x = v; }
 
     // static get staticX() { return this._x; }
     // static set staticX(v) { this._x = v; }
   }
 
   // assertTrue(C.prototype.hasOwnProperty('x'));
   // assertTrue(C.hasOwnProperty('staticX'));
 
   // var c = new C(1);
   // c._x = 1;
   // assertEquals(1, c.x);
 
 })();