⭐ in reply to How can I tell at run time that my script is writing to STDERR?

use the $SIG{__WARN__}: 
$SIG{__WARN__} = sub { die $_[0] };
warn "This will be fatal\n";
print "You will never get to this line\n";

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See perlvar for more info.
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In Section Seekers of Perl Wisdom