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regSpill: out of spill slots!

runghc ./Setup.hs build
Building 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    = 2040

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Edited by Ian Lynagh -
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