Redefining a function only produces a warning if "use warnings" is in effect. So classic monkey patching will not necessarily produce compile-time warnings.

If a conflict warning is desired, that's fairly easy to add in with my method...

BEGIN {
   require Example::Error;
   foreach my $method (qw/asplode/) {
     warn "Example::Error->$method already defined."
       if Example::Error->can($method);
   }
   push @Example::Error::ISA, __PACKAGE__;
 }

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In reply to Re^2: Safer monkey-patching by tobyink
in thread Safer monkey-patching by tobyink

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