[Dancer-users] why does "warn" fail?

As a perl veteran I am used to using the built-in "warn" function to write to STDERR. Under mod_perl/Apache this prints to the web server's error log. Using my dancer app like this: plackup -L Shotgun app.pl If I have a "warn" anywhere in my app, I get an error message: Error trace status code needs to be an integer greater than or equal to 100 at /usr/local/lib/perl5/site_perl/5.12.2/Plack/Middleware/StackTrace.pm line 27 However, if I print STDERR "msg"; that works. My question is: what happened to warn? Can it be fixed so that it writes to STDERR instead of triggering an error message? I know about the "warning" function but it's really hard to change 10 years of muscle memory! Thanks, Brian