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GHC Panic "reifyType PredTy" in HAppS.Data.IxSet.inferIxSet

Exception when trying to run compile-time code:
  ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for x86_64-unknown-linux):
      reifyType PredTy

Code reproducing this bug can be found at: http://hpaste.org/fastcgi/hpaste.fcgi/view?id=2419

Marked as critical because I haven't found a workaround yet.

Edited by Simon Peyton Jones
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