runghc ./Setup.hs buildBuilding SHA-1.5.0.0...Preprocessing library SHA-1.5.0.0...[1 of 1] Compiling Data.Digest.Pure.SHA ( Data/Digest/Pure/SHA.hs, dist/build/Data/Digest/Pure/SHA.o )ghc: panic! (the 'impossible' happened) (GHC version 7.2.0.20110728 for x86_64-unknown-linux): regSpill: out of spill slots! regs to spill = 2479 slots left = 2040Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug