How to reproduce:

$ curl http://searchpath.org/searchpath/SearchPath.hs > SearchPath.hs
$ ghc --make SearchPath.hs -o sp
$ ./sp -f runghc --sp HAppS.Protocols.HTTP.FileServer --http-port=7000

searchpath will download all the needed modules and calls out to shell to run this:
  runghc -i.haskell_cache/http_searchpath.org-default.map.cache 
.haskell_cache/http_searchpath.org-default.map.cache/HAppS/Protocols/HTTP/FileServer.hs
 --http-port=7000

which produces the following error:

  ghc-6.6: panic! (the 'impossible' happened)
    (GHC version 6.6 for i386-apple-darwin):
          ByteCodeFFI.mkMarshalCode_wrk(x86) L_

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

Replacing runghc above with ghci causes a similar panic but because it tells you what module it is processing, implies that it is being killed by something in Data.Binary.Builder

-Alex-


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