Indeed, this problem is not really solvable. However, my solution does offer a partial way forward.
Let's imagine that My::AwesomeError and Your::GroovyError both superclass Example::Error, and both add an asplode method.
We can then do:
my $err = Example::Error->new('Heat death of universe detected!');
$err->asplode(); # Russian roulette
With true monkey patching, where My::AwesomeError and Your::GroovyError each defined the asplode method directly in the Example::Error namespace, we wouldn't get the option to do the above.
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