[GHC] #12433: GHCi produces incorrect results when evaluating with compiled code

[GHC]

#12433: GHCi produces incorrect results when evaluating with compiled code
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        Reporter:  diatchki          |                Owner:  simonmar
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  ghci, dynamic
                                     |  linking, compiled code
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonmar):

 * owner:   => simonmar


Comment:

 I think I see the problem: `genSwitch` is assuming that it can modify the
 register it got from evaluating the scrutinee, but it has no right to do
 that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12433#comment:11>
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