harmony-scoping: make assignment to 'const' a late error.

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-classes --harmony-sloppy
 
 (function TestBasics() {
   var C = class C {}
   assertEquals(typeof C, 'function');
   assertEquals(C.__proto__, Function.prototype);
@@ skipping 665 matching lines @@
 
   new Derived(1, 2, 3);
   assertEquals(3, args.length);
   assertEquals(1, args[0]);
   assertEquals(2, args[1]);
   assertEquals(3, args[2]);
 })();
 
 
 (function TestNameBindingConst() {
-  assertThrows('class C { constructor() { C = 42; } }', SyntaxError);
-  assertThrows('(class C { constructor() { C = 42; } })', SyntaxError);
-  assertThrows('class C { m() { C = 42; } }', SyntaxError);
-  assertThrows('(class C { m() { C = 42; } })', SyntaxError);
-  assertThrows('class C { get x() { C = 42; } }', SyntaxError);
-  assertThrows('(class C { get x() { C = 42; } })', SyntaxError);
-  assertThrows('class C { set x(_) { C = 42; } }', SyntaxError);
-  assertThrows('(class C { set x(_) { C = 42; } })', SyntaxError);
+  assertThrows('class C { constructor() { C = 42; } }; new C();', TypeError);
+  assertThrows('new (class C { constructor() { C = 42; } })', TypeError);
+  assertThrows('class C { m() { C = 42; } }; new C().m()', TypeError);
+  assertThrows('new (class C { m() { C = 42; } }).m()', TypeError);
+  assertThrows('class C { get x() { C = 42; } }; new C().x', TypeError);
+  assertThrows('(new (class C { get x() { C = 42; } })).x', TypeError);
+  assertThrows('class C { set x(_) { C = 42; } }; new C().x = 15;', TypeError);
+  assertThrows('(new (class C { set x(_) { C = 42; } })).x = 15;', TypeError);
 })();
 
 
 (function TestNameBinding() {
   var C2;
   class C {
     constructor() {
       C2 = C;
     }
     m() {
@@ skipping 66 matching lines @@
   }, ReferenceError);
 
   assertThrows(function() {
     (class x extends x {});
   }, ReferenceError);
 
   assertThrows(function() {
     var x = (class x extends x {});
   }, ReferenceError);
 })();