[GHC] #8265: getTokenStream fails for source using cpp

[GHC]

#8265: getTokenStream fails for source using cpp
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              Reporter:  alanz       |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  GHC API     |          Version:  7.6.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Compile-    |       Blocked By:
  time crash                         |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * os:  Linux => Unknown/Multiple


Comment:

 To reproduce, use `BCpp.hs` and `tokenbug.2.hs` from above.

 {{{
 $ cabal install ghc-paths

 $ ghc -package ghc tokenbug.2.hs

 $ ./tokenbug.2
 got saf:("./BCpp.hs",<stringbuffer(199,0)>)
 got src:[{-# LANGUAGE CPP #-}
 -- Check that we can parse a file which requires CPP
 module BCpp where

 bob :: Int -> Int -> Int
 #if __GLASGOW_HASKELL__ > 704
 bob x y = x + y
 #else
 bob x y = x + y * 2
 #endif


 ]
 got saf:("./BCpp.hs",<stringbuffer(199,0)>)
 tokenbug.2: panic! (the 'impossible' happened)
   (GHC version 7.8.3 for x86_64-unknown-linux):
         parse failed
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8265#comment:1>
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