On 03/15/2011 06:31 PM, Darin Adler wrote:
On Mar 15, 2011, at 8:16 AM, Gregor Richards wrote:
We maintain an instrumented branch of WebKit to do various dynamic measurements
of JavaScript. One of our changes which should have no semantic effect on the
behavior of JS is actually causing a visible change in the behavior of (at
least) http://about.com/ . The visible difference is that the menus don't work,
and the underlying reason seems to be that Array.prototype.slice is (rather
inexplicably) being rewritten to undefined, causing further code to fail. I've
worked the issue down to a single line
It’s good that you reduced your JavaScript changes down to a single line. Next
step would be to make a local copy of the about.com site, reproduce the bug
with that, and then reduce it as well. Once you do that it you can get to the
bottom of it quickly.
-- Darin
I hadn't done that yet because at this point I wasn't sure whether it
was our bug or not. I just wanted to know whether I was correct in my
assumption that these changes should not induce a behavioral difference.
If that's the case, then absolutely I'll try to create a minimal test case.
- Gregor Richards
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