Welp, I'm sorry for spamming the board since I've found the solution 
already. For posterity, here's how to make logging work in a Haskell app 
without tearing out your hair:

hSetBuffering stdout NoBuffering

Best,
Jon

On Thursday, July 17, 2014 5:30:42 PM UTC-7, Jonathan Sterling wrote:
>
> I hope this is the right place to ask this question. I have a Haskell app 
> running on Cedar, and I am having some trouble with logging. When I print 
> to stdout and run my app locally, I can see the output; but it does not 
> appear in `heroku logs`. In fact, `heroku logs --source app` is quite 
> empty. Has anyone experienced something similar, or has any suggestions? 
> Let me know if you need any more information.
>
> Thanks very much for your help!
> Jon
>

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