[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 simonmar):

 I suggested to @bgamari today that it might be possible to support
 `unsafe` foreign calls in GHCi with the same behaviour as compiled code
 (i.e. no GC during the call guaranteed) by avoiding the `suspendThread()`
 / `resumeThread()` calls that the interpreter makes in the bci_CCALL byte
 code implementation.  We'd need to include a flag with the byte code to
 indicate that the call is unsafe, but there's already a flag being passed
 for interruptible so there's room for another flag in the same word.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8281#comment:27>
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