Turns out this was a trick question--the thing that I thought was a hashref really was. It was the next line with the grep that was failing. That regex should have been /^gene/ instead. As a result, the @keys array was empty, making it look later on like I didn't having anything in the hash.

D'oh!

Thanks anyway,

Scott
Project coordinator of the Generic Model Organism Database Project

In reply to Re: Hash references moving between modules by scain
in thread Hash references moving between modules by scain

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