[GHC] #12523: Constructor info tables generated by GHCi don't return tagged pointers

[GHC]

#12523: Constructor info tables generated by GHCi don't return tagged pointers
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        Reporter:  mniip             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.1
      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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Comment (by mniip):

 Replying to [comment:1 simonpj]:

 The whole problem lies in the code assigned to the `Y` constructor. When
 ghci uses `X` it uses the compiled info table and entry code so no problem
 arises.

 Indeed this bug is impossible to trigger without unsafeCoerce or other
 questionable functions.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12523#comment:3>
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