Reland of Ship ES2015 sloppy-mode function hoisting, let, class

test/mjsunit/harmony/block-let-contextual-sloppy.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-sloppy --harmony-sloppy-let --harmony-destructuring-bind
-
-// let is usable as a variable with var or legacy const, not let or ES6 const
-
-(function (){
-  assertEquals(undefined, let);
-
-  var let;
-
-  let = 5;
-  assertEquals(5, let);
-
-  (function() { var let = 1; assertEquals(1, let); })();
-  assertEquals(5, let);
-})();
-
-assertThrows(function() { return let; }, ReferenceError);
-
-(function() {
-   var let, sum = 0;
-   for (let in [1, 2, 3, 4]) sum += Number(let);
-   assertEquals(6, sum);
-
-   (function() { for (var let of [4, 5]) sum += let; })();
-   assertEquals(15, sum);
-
-   (function() { for (var let in [6]) sum += Number([6][let]); })();
-   assertEquals(21, sum);
-
-   for (let = 7; let < 8; let++) sum += let;
-   assertEquals(28, sum);
-   assertEquals(8, let);
-
-   (function() { for (var let = 8; let < 9; let++) sum += let; })();
-   assertEquals(36, sum);
-   assertEquals(8, let);
-})();
-
-assertThrows(function() { return let; }, ReferenceError);
-
-(function () {
-  let obj = {};
-  var {let} = {let() { return obj; }};
-  let().x = 1;
-  assertEquals(1, obj.x);
-})();
-
-(function () {
-  let obj = {};
-  const [let] = [function() { return obj; }];
-  let().x = 1;
-  assertEquals(1, obj.x);
-})();
-
-(function() {
-  function let() {
-    return 1;
-  }
-  assertEquals(1, let());
-})()
-
-assertThrows('for (let of []) {}', SyntaxError);