628937 - Previously working application fails with "... is not a constructor" in Fx 4 trunk since 25/1/2011

Status: RESOLVED DUPLICATE of bug 628612

(Core :: JavaScript Engine, defect)

Description

[Duncan Loveday]

User-Agent:       Mozilla/5.0 (Windows NT 5.1; rv:2.0b10pre) Gecko/20110125 Firefox/4.0b10pre
Build Identifier: Built from http://hg.mozilla.org/mozilla-central/rev/6a097e294828

The attached javascript code fails in the Fx 4 trunk with "Range is not a constructor" when prior to 25/1/2011 it would run successfully.

Reproducible: Always

Steps to Reproduce:
1. Open the test case and click the button
2. Note the lack of any alert message and the messages in the error console
3.
Actual Results:  
In step 2, no alert is shown and the error console contains this error

Error: Range is not a constructor
Source File: file:///C:/Temp/test.html
Line: 17

Expected Results:  
In step 2, an alert "r.getValue()=123" should be shown and there should be no errors in the console.

In my full app I sometimes see a different error but I have not been able to reproduce that in a reduced test case.

Error: can't redefine non-configurable property 'Range'
Source File: http://147.149.196.167:61002/BPTMPresentation/slider/js/range.js
Line: 33

Comment 1

[Duncan Loveday]

Attachment: Test case

Comment 2

[Alice0775 White]

Regression window(m-c hourly):
Works:
http://hg.mozilla.org/mozilla-central/rev/fa9577c17daf
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b10pre) Gecko/20110124 Firefox/4.0b10pre ID:20110124194331
Fails:
http://hg.mozilla.org/mozilla-central/rev/7ee91bd90e7a
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b10pre) Gecko/20110124 Firefox/4.0b10pre ID:20110124195551
Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=fa9577c17daf&tochange=7ee91bd90e7a

Regression window(TM hourly):
Works:
http://hg.mozilla.org/tracemonkey/rev/a4b72ddb9e6e
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b10pre) Gecko/20110121 Firefox/4.0b10pre ID:20110122143256
Fails:
http://hg.mozilla.org/tracemonkey/rev/e8753473cdff
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b10pre) Gecko/20110121 Firefox/4.0b10pre ID:20110122155416
Pushlog:
http://hg.mozilla.org/tracemonkey/pushloghtml?fromchange=a4b72ddb9e6e&tochange=e8753473cdff
Candidate:
e4d449cdd3be	Jeff Walden — Bug 577325 - Implement function definition per ES5 plus errata (still with support for our extensions, of course). r=igor

Comment 3

[Boris Zbarsky [:bzbarsky]]

This looks like the same issue as bug 628612.  Can you please confirm that this is fixed in today's nightly?

Comment 4

[Duncan Loveday]

It's working on this version

Built from http://hg.mozilla.org/mozilla-central/rev/e0fc18b3bc41