Dear Haskellers,

As some of you may have seen if you have me in one of your circles, I'm working on a webapp where you paste haskell code and get the GHC Core for it in return. This is all going pretty smoothly, except for one thing. 

I must forbid the use of Template Haskell (which allows arbitrary I/O at compile time) and some other nasty extensions (ability to call out to other binaries -- preprocessors and the likes -- among other things). This would be ideal: -- but I haven't seen anything about it in HEAD nor in the last releases.

How would you guys go about doing this?

Thanks for taking some time for a fellow haskeller.
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