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The impossible happened: primRepToFFIType

I ran into this error while trying to use GHCi on the hashable package:

$ cabal repl
Preprocessing library hashable-1.2.0.10...
GHCi, version 7.6.2: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package array-0.4.0.1 ... linking ... done.
Loading package deepseq-1.3.0.1 ... linking ... done.
Loading package bytestring-0.10.0.2 ... linking ... done.
Loading package text-0.11.3.1 ... linking ... done.
Loading object (static) dist/build/cbits/fnv.o ... done
Loading object (static) dist/build/cbits/getRandomBytes.o ... done
final link ... done
[1 of 4] Compiling Data.Hashable.RandomSource ( Data/Hashable/RandomSource.hs, interpreted ) [flags changed]
[2 of 4] Compiling Data.Hashable.Class ( Data/Hashable/Class.hs, interpreted ) [flags changed]
ghc: panic! (the 'impossible' happened)
  (GHC version 7.6.2 for x86_64-apple-darwin):
	primRepToFFIType

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Trac metadata
Trac field Value
Version 7.6.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
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