I used to do this in the pre-5.6 days with a __WARN__ handler:

$SIG{'__WARN__'} = sub { die $_[0]};

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Or something along those lines. I used it when I wanted find the cause of warnings in a very long-running script. I'd start the script with -d, and when it hit a warning it would pop me into the debugger and I could check the current value of all variables, step forward, etc.

In reply to Re: debugging trick of the week: fatal warnings by perrin
in thread debugging trick of the week: fatal warnings by gav^

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