Could it be that the modules that you are reloading, contain a use warnings; themselves, which would override the no warnings 'redefine'; inside the eval?

If that's the case, I wouldn't know of a simple solution to this problem, other than reading the contents of the file to be required into a variable (e.g. $source) and then doing a:

$source =~ s#(use warnings[^;]*)#$1;no warnings 'redefine'#sg;
eval $source;
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This is pretty yucky, though. And may fail when the required file itself uses or requires other files.

I guess more rigorous methods such as adding a subroutine handler to @INC or stealing CORE::require would be methods for handling this reliably.

Or maybe simplify matters by installing a __WARN__ handler that would filter out the redefined warnings?

Hope this helps.

Liz