[GHC] #8281: The impossible happened: primRepToFFIType

[GHC]

#8281: The impossible happened: primRepToFFIType
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        Reporter:  tibbe             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  7.6.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by winter):

 This is a very important technique to write high performance array code(we
 can't put everything related to ByteArray into ghc-prim after all). I'd
 like to get it fixed in GHCi and  document it(include caveats) . what is
 stopping GHCi supporting unsafe FFI calls?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8281#comment:22>
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