I use warn, carp, etc for permanent assertions and unexpected/garbled runtime inputs and system conditions that need to be part of production code. I use print STDERR for temporary statements to peek into problem code. This makes it easy for me to do a search and replace (just search for STDERR) after I've diagnosed the problem.

For more permanent diagnostic abilities, I design my code so that repeatable test suites can "peek" at and verify the code's state. I find that more reliable than debugging by observation...and less work over the long run. Also it keeps the code uncluttered of assertions that only matter when debugging.

Best, beth

In reply to Re: using warn instead or print STDERR? by ELISHEVA
in thread using warn instead or print STDERR? by leocharre

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