Bug 48689 – ES5 Strict mode: `arguments' identifier in strict mode is immutable

• Status: RESOLVED
• Resolution: FIXED
• Component: JavaScriptCore

[Asen Bozhilov]

/**
 * For strict mode functions, if an arguments object is created the binding of the local identifier
 * arguments to the arguments object is immutable and hence may not be the target of an
 * assignment expression. (10.5).
 */

var testDesc = 'In function body assigning value of arguments must produce an Error: ';

function F(arg, arg1, arg2) {
    'use strict';
    arguments = false;
};

try {
    F(1, 2, 3);
    util.printLine(testDesc + 'FALSE');
} catch (e) {
    util.printLine(testDesc + 'TRUE');
}

[Asen Bozhilov]

Great work WebKit! I've made 53 tests. There is only one fail and one test which cannot be done with current state of WebKit. You can see the test cases: 

http://github.com/abozhilov/strict-tester-

[Asen Bozhilov]

The proper url is: http://github.com/abozhilov/strict-tester-/tree/

[Oliver Hunt]

I fixed this some time ago due to another report