ghc-6.9.20080614: panic! (the 'impossible' happened)

[ 7 of 78] Compiling Data.Array.Parallel.Base.Rebox ( Data/Array/Parallel/Base/Rebox.hs, dist/build/Data/Array/Parallel/Base/Rebox.o )
ghc-6.9.20080614: panic! (the 'impossible' happened)
  (GHC version 6.9.20080614 for i386-apple-darwin):
	initC: srt_lbl

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

<<ghc: 85934552 bytes, 26 GCs, 2419370/5914624 avg/max bytes residency (3 samples), 11M in use, 0.00 INIT (0.00 elapsed), 0.17 MUT (1.05 elapsed), 0.08 GC (0.09 elapsed) :ghc>>

Edited Mar 09, 2019 by Ian Lynagh -

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ghc-6.9.20080614: panic! (the 'impossible' happened)