136113 - for statement erroneously generates JavaScript error.

Status: VERIFIED DUPLICATE of bug 131348

(Core :: JavaScript Engine, defect)

Description

[Huazhang Shao]

Try the following for statement on Mozilla 0.9.9+ (Build ID: 2002040708)
	for(i in null)
		alert(i);
It erroneously generates a JavaScript error (Error: null has no properties) in
JavaScript console.

JavaScript engines in Internet Explorer 5&6, Netscape 4.7x, Netscape 6.2.1 can
all handle this for statement without problem.

BTW, I detected the bug on Mozilla 0.9.9+ Mozilla/5.0 (Windows; U; Windows NT
5.0; en-US; rv:0.9.9+) Gecko/20020407 (Build ID: 2002040708).

Comment 1

[Christopher Aillon (sabbatical, not receiving bugmail)]

Please read the release notes: http://www.mozilla.org/releases/mozilla0.9.9/

* The following JavaScript snippet now throws an error:
      for (var foo in undefined) {}.

This change was made in order to comply with ECMA-262 3rd Edition Final. (Bug
121744)



*** This bug has been marked as a duplicate of 131348 ***

Comment 2

[Huazhang Shao]

Attachment: HTML/JavaScript Testcase

Open Javascript console to see the error message.

Comment 3

[Phil Schwartau]

Verified Duplicate -