Revert of [es6] implement default parameters via desugaring

test/mjsunit/harmony/default-parameters.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-default-parameters --harmony-arrow-functions
-
-function return_specified() { return "specified"; }
-
-var method_returns_specified = {
-  method() { return "specified"; }
-};
-
-
-(function testDefaultFunctions() {
-  function optional_function(handler = function() { }) {
-    assertEquals("function", typeof handler);
-
-    // TODO(caitp): infer function name correctly
-    // (https://code.google.com/p/v8/issues/detail?id=3699)
-    // assertEquals("handler", handler.name);
-
-    return handler();
-  }
-  assertEquals(undefined, optional_function());
-  assertEquals(undefined, optional_function(undefined));
-  assertEquals("specified", optional_function(return_specified));
-})();
-
-
-(function testDefaultFunctionReferencesParameters() {
-  function fn1(handler = function() { return value; }, value) {
-    return handler();
-  }
-  assertEquals(undefined, fn1());
-  assertEquals(undefined, fn1(undefined, undefined));
-  assertEquals(1, fn1(undefined, 1));
-
-  function fn2(value, handler = function() { return value; }) {
-    return handler();
-  }
-  assertEquals(undefined, fn2());
-  assertEquals(undefined, fn2(undefined));
-  assertEquals(1, fn2(1));
-})();
-
-
-(function testDefaultObjects() {
-  function optional_object(object = { method() { return "method"; } }) {
-    assertEquals("object", typeof object);
-
-    assertEquals("function", typeof object.method);
-    return object.method();
-  }
-
-  assertEquals("method", optional_object());
-  assertEquals("method", optional_object(undefined));
-  assertEquals("specified", optional_object(method_returns_specified));
-
-
-  assertEquals(4, (function(x = { a: 4 }) { return x.a; })());
-  assertEquals(5, (function(x, y = { a: x }) { return y.a; })(5));
-  assertEquals(6, (function(x, y = { a: eval("x") }) { return y.a; })(6));
-})();
-
-
-// TDZ
-
-(function testReferencesUninitializedParameter() {
-  assertThrows(function(a = b, b) {}, ReferenceError);
-})();
-
-
-(function testEvalReferencesUninitializedParameter() {
-  assertThrows( function(x = { a: y }, y) { return x.a; }, ReferenceError);
-  assertThrows(function(a = eval("b"), b = 0) { return a; }, ReferenceError);
-  assertThrows(
-      function(x = { a: eval("y") }, y) { return x.a; }, ReferenceError);
-})();
-
-
-(function testReferencesInitializedParameter() {
-  assertEquals(1, (function(a = 1, b = a) { return b; })());
-})();
-
-
-// Scoping
-//
-// TODO(caitp): fix scoping --- var declarations in function body can't be
-// resolved in formal parameters
-// assertThrows(function referencesVariableBodyDeclaration(a = body_var) {
-//   var body_var = true;
-//   return a;
-// }, ReferenceError);
-
-
-// TODO(caitp): default function length does not include any parameters
-// following the first optional parameter
-// assertEquals(0, (function(a = 1) {}).length);
-// assertEquals(1, (function(a, b = 1) {}).length);
-// assertEquals(2, (function(a, b, c = 1) {}).length);
-// assertEquals(3, (function(a, b, c, d = 1) {}).length);
-// assertEquals(1, (function(a, b = 1, c, d = 1) {}).length);
-
-
-(function testInitializerReferencesThis() {
-  var O = {};
-  function fn(x = this) { return x; }
-  assertEquals(O, fn.call(O));
-
-  function fn2(x = () => this) { return x(); }
-  assertEquals(O, fn2.call(O));
-})();
-
-
-(function testInitializerReferencesSelf() {
-  function fn(x, y = fn) { return x ? y(false) + 1 : 0 }
-  assertEquals(1, fn(true));
-})();
-
-
-(function testInitializerEvalParameter() {
-  assertEquals(7, (function(x, y = eval("x")) { return y; })(7));
-  assertEquals(9, (function(x = () => eval("y"), y = 9) { return x(); })());
-})();
-
-
-(function testContextAllocatedUsedInBody() {
-  assertEquals("Monkey!Monkey!Monkey!", (function(x, y = eval("x")) {
-    return "Mon" + x + "Mon" + eval("y") + "Mon" + y;
-  })("key!"));
-  assertEquals("Monkey!", (function(x = "Mon", y = "key!") {
-    return eval("x") + eval("y");
-  })());
-})();
-
-
-(function testContextAllocatedEscapesFunction() {
-  assertEquals("Monkey!", (function(x = "Monkey!") {
-    return function() {
-      return x;
-    };
-  })()());
-})();