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Compile crashed with panic! (the 'impossible' happened)

The following code results in a compiler crash with error

ghc: panic! (the 'impossible' happened)
  (GHC version 7.4.1 for x86_64-unknown-linux):
	nameModule show{tv a9N}

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

The code can be found at http://pastie.org/8692515

Edited by Herbert Valerio Riedel
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