[es6] implement spread calls

test/mjsunit/harmony/spread-call-new.js

+// Copyright 2015 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
+
+(function testNonConstructorStrict() {
+  "use strict";
+  assertThrows(function() {
+    return new Math.cos(...[1,2,3]);
+  }, TypeError);
+
+  assertThrows(function() {
+    var CallNull = null;
+    return new CallNull(...[1,2,3]);
+  }, TypeError);
+})();
+
+
+(function testNonConstructorSloppy() {
+  assertThrows(function() {
+    return new Math.cos(...[1,2,3]);
+  }, TypeError);
+
+  assertThrows(function() {
+    var CallNull = null;
+    return new CallNull(...[1,2,3]);
+  }, TypeError);
+})();
+
+
+(function testConstructStrict() {
+  "use strict";
+  function TestClass(a, b, c) {
+    this.wasCalled = true;
+    this.args = [a, b, c];
+  }
+  TestClass.prototype.method = function() {
+    return this.args;
+  }
+
+  assertInstanceof(new TestClass(...[1, 2, 3]), TestClass);
+  assertEquals([1, 2, 3], (new TestClass(...[1, 2, 3])).method());
+  assertEquals([1, 2, 3], (new TestClass(...[1, 2, 3])).args);
+  assertTrue((new TestClass(...[1, 2, 3])).wasCalled);
+})();
+
+
+(function testConstructSloppy() {
+  function TestClass(a, b, c) {
+    this.wasCalled = true;
+    this.args = [a, b, c];
+  }
+  TestClass.prototype.method = function() {
+    return this.args;
+  }
+
+  assertInstanceof(new TestClass(...[1, 2, 3]), TestClass);
+  assertEquals([1, 2, 3], (new TestClass(...[1, 2, 3])).method());
+  assertEquals([1, 2, 3], (new TestClass(...[1, 2, 3])).args);
+  assertTrue((new TestClass(...[1, 2, 3])).wasCalled);
+})();