I managed to track down the problem at last. And, as might be expected
after staring at it for so long, it was a fairly boneheaded thing. Turns
out the error was from an entirely different thread which is using
Attoparsec and a modified version of attoparsec-iteratee. I never
suspected this thread because I'd previously verified the correctness of
the parser (which is indeed correct). The problem is a coworker changed
the format of the file that thread was reading, and I'd never bothered
to give the parser robust and helpful error messages <chagrin>
Thanks all, for helping with the latent bugs in the code I posted and
for convincing me that I really wasn't just missing something there.
--
Live well,
~wren
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