[GHC] #8273: ghc: panic! (the 'impossible' happened)

[GHC]

#8273: ghc: panic! (the 'impossible' happened)
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        Reporter:  ready2go                      |            Owner:
            Type:  bug                           |           Status:  new
        Priority:  normal                        |        Milestone:
       Component:  Compiler                      |          Version:  7.4.1
      Resolution:                                |         Keywords:
Operating System:  Unknown/Multiple              |     Architecture:
 Type of failure:  None/Unknown                  |  x86_64 (amd64)
       Test Case:  Prelude>  data Shape =        |       Difficulty:
  Circle Float Float Float | Rectangle Float     |  Unknown
  Float Float Float deriving (show)              |       Blocked By:
        Blocking:                                |  Related Tickets:
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Description changed by jstolarek:

Old description:

> Prelude>  data Shape = Circle Float Float Float | Rectangle Float Float
> Float Float deriving (show)
> ghc: panic! (the 'impossible' happened)
>   (GHC version 7.4.1 for x86_64-unknown-linux):
>         nameModule show{tv a9J}
>
> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
>
> My Apologies if this is a duplicate, first time I have used trac, or this
> system- reproduced fault twice from fresh start of GHCi it twice on my
> Ubuntu 12.04 LTS system, using Haskell platform from Ubuntu repository

New description:

 {{{
 Prelude>  data Shape = Circle Float Float Float | Rectangle Float Float
 Float Float deriving (show)
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.4.1 for x86_64-unknown-linux):
         nameModule show{tv a9J}

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

 My Apologies if this is a duplicate, first time I have used trac, or this
 system- reproduced fault twice from fresh start of GHCi it twice on my
 Ubuntu 12.04 LTS system, using Haskell platform from Ubuntu repository

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8273#comment:2>
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