I'm using the "block" eval, which is just a "try/catch" mechanism, so I can "die" deep in parsing recursion and still be able to go on to the next test case. It's just a different feature with the same name as the "string" eval, which is what they don't want to allow.

I could have used a hash to map operations to their proper subs, but why bother when perl already has a hash that does that for me. "Polymorphism forever!" hehehe

"Ah, I think I got it," - yes, yes you do :)