[GHC] #9147: defining data type in GHC results in ghc: panic! (the 'impossible' happened)

[GHC]

#9147: defining data type in GHC results in ghc: panic! (the 'impossible'
happened)
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        Reporter:  tdp93422    |            Owner:
            Type:  bug         |           Status:  closed
        Priority:  normal      |        Milestone:
       Component:  GHCi        |          Version:  7.4.1
      Resolution:  duplicate   |         Keywords:
Operating System:  Linux       |     Architecture:  Unknown/Multiple
 Type of failure:  GHCi crash  |       Difficulty:  Unknown
       Test Case:              |       Blocked By:
        Blocking:              |  Related Tickets:
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Changes (by rwbarton):

 * status:  new => closed
 * resolution:   => duplicate


Comment:

 Duplicate of #5961, fixed since GHC 7.6. `deriving (read, show, eq, ord)`
 should be `deriving (Read, Show, Eq, Ord)`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9147#comment:1>
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