The problem here, as you no doubt guessed, is that somewhere in the guts of Carp we attempt to stringify your object again, kicking off the asString method (yet again) to try and do this.

The solution here is to detect when that's happened and return a static string, rather than calling confess again. Here's an example:

sub asString { return __PACKAGE__ if (caller)[1] =~ /Carp/; confess; }
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That nicely breaks the recursion. Discovering why Carp is trying to stringify your object is left as an exercise for the reader. ;)

Cheers,
Paul