Panic! the 'impossible' happened: charType: '\167'
Reproduces each time:
Prelude> "\§"
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.4 for x86_64-unknown-linux):
charType: '\167'
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug