in reply to Log4perl swallowing $@

You're surprised that a commonly used global variable gets used? Yeah, the logger should localise it's use — file a bug report — but that's rarely done, and it's not biggy that it doesn't. 

if (my $e = $@) {
    print $e;
    $logger->debug('test');
    print $e;
    print 'after printing $e';
}

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Re^2: Log4perl swallowing $@
by saberworks (Curate) on Oct 28, 2010 at 20:31 UTC
    You're right, it should be obvious that any external bit of code could use $@, thanks for that. I'm so used to seeing if($@) { # handle error } that I didn't really think about it properly.
[reply]
      Oh I don't know about that. Actually, I think you *are* thinking about it properly. Although it makes sense that external code will refer to certain variables, it is natural to expect that said code won't walk all over those variables without restoring them or at least telling you about it in some way. File that report, in my opinion.
[reply]
        There is no bug, the expectations are wrong

        The variable $@ is never touched in Log4perl

        However log4perl does use eval

        Its just like $!, its only valid immediately after a system call, if you want to use it at few lines later, you have to cache it.

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