Does using $ev in place of $_ in the last line of this snippet (in the real code) make any difference? 

        my $ev = $_; #### You set $ev = $_ here
        if ($sometimes) { # sometimes goes this path and sometimes the
+ else
            eval {
                dave('proc2', {}, 'arg1', 'arg2');
                1;
            } or $log->warn("failed $@");
        } else {
            $log->logwarn("test $_"); #### But then use $_ here

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In reply to Re^5: panic: attempt to copy freed scalar a7b9650 to ad20598 by BrowserUk
in thread panic: attempt to copy freed scalar a7b9650 to ad20598 by mje

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