The problem probably is that eval is great for trapping errors and allowing you to deal with them nicely, but it doesn't do anything for trapping warnings.

For that you have to set up a $SIG{__WARN__} handler.

See warn for a brief discussion on how to trap warnings. Also, look at perlvar for info on setting %SIG entries, and the Carp module's POD for a more detailed discussion on error and warning handling.

What you're thinking are errors might, in fact, just be warnings.