[GHC] #12850: Panic with unboxed integers and ghci

[GHC]

#12850: Panic with unboxed integers and ghci
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        Reporter:  monoidal          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHCi crash        |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * cc: ezyang (added)


Comment:

 GHC shouldn't panic, but is GHCi supposed to handle unboxed values, these
 days?  I've lost track.

 Edward in 11ff1df8 made some changes to `getIdFromTrivialExpr`.

 Edward might you look?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12850#comment:1>
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