[es6] implement spread calls

test/mjsunit/harmony/spread-call-new-class.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-spreadcalls --harmony-sloppy --harmony-classes

[arv (Not doing code reviews), 2015/03/30 22:19:49]

--harmony-classes can be removed

+// Flags: --harmony-rest-parameters
+
+
+(function testConstructClassStrict() {
+  "use strict";
+  class Base {
+    constructor(...args) {
+      this.baseArgs = args;
+    }
+    method() { return this.baseArgs; }
+  }
+
+  class Child extends Base {
+    constructor(...args) {
+      super(...args);

[arv (Not doing code reviews), 2015/03/30 22:19:49]

Maybe also add a case with `super(x, ...y)`

[arv (Not doing code reviews), 2015/03/30 22:19:49]

Awesome!

[caitp (gmail), 2015/03/30 22:38:12]

Acknowledged.

+      this.childArgs = args;
+    }
+  }
+
+  var c = new Base(...[1, 2, 3]);
+  assertInstanceof(c, Base);
+  assertEquals([1, 2, 3], c.method());
+  assertEquals([1, 2, 3], c.baseArgs);
+
+  c = new Child(...[1, 2, 3]);
+  assertInstanceof(c, Child);
+  assertInstanceof(c, Base);
+  assertEquals([1, 2, 3], c.method());
+  assertEquals([1, 2, 3], c.baseArgs);
+  assertEquals([1, 2, 3], c.childArgs);
+})();
+
+
+(function testConstructSloppy() {
+  class Base {
+    constructor(...args) {
+      this.baseArgs = args;
+    }
+    method() { return this.baseArgs; }
+  }
+
+  class Child extends Base {
+    constructor(...args) {
+      super(...args);
+      this.childArgs = args;
+    }
+  }
+
+  var c = new Base(...[1, 2, 3]);
+  assertInstanceof(c, Base);
+  assertEquals([1, 2, 3], c.method());
+  assertEquals([1, 2, 3], c.baseArgs);
+
+  c = new Child(...[1, 2, 3]);
+  assertInstanceof(c, Child);
+  assertInstanceof(c, Base);
+  assertEquals([1, 2, 3], c.method());
+  assertEquals([1, 2, 3], c.baseArgs);
+  assertEquals([1, 2, 3], c.childArgs);
+})();