[GHC] #9193: GHC panic usinig HList and Lens

[GHC]

#9193: GHC panic usinig HList and Lens
-------------------------------+-------------------------------------------
        Reporter:  maxigit     |            Owner:
            Type:  bug         |           Status:  new
        Priority:  normal      |        Milestone:
       Component:  Compiler    |          Version:  7.6.3
      Resolution:              |         Keywords:
Operating System:              |     Architecture:  x86
  Unknown/Multiple             |       Difficulty:  Easy (less than 1 hour)
 Type of failure:  GHCi crash  |       Blocked By:
       Test Case:              |  Related Tickets:
        Blocking:              |
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Comment (by maxigit):

 There is only one line of code ... I get the following error message


 {{{
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.6.3 for x86_64-apple-darwin):
         lookupVers2
 <<details unavailable>>

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

 So I did I. As I said I tried with 7.8.2 but I couldn't install some
 dependencies which are mainly text and distributive :-(

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9193#comment:2>
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