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Panic: the impossible happened charType '\955'

GHCi 7.0.3 panic on loading file with multiline strings and Unicode characters:

dpm@dpm-laptop:~/Projects/PL/pl/pl2$ ghci Debug/GHCCrash.hs 
GHCi, version 7.0.3: 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 ffi-1.0 ... linking ... done.
ghc: panic! (the 'impossible' happened)
  (GHC version 7.0.3 for i386-unknown-linux):
	charType: '\955'

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

Minimum file necessary to reproduce attached.

Edited by Ian Lynagh -
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