[GHC] #4235: deriving Enum fails for data instances

[GHC]

#4235: deriving Enum fails for data instances
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    Reporter:  nestra                                   |        Owner:                              
        Type:  bug                                      |       Status:  new                         
    Priority:  normal                                   |    Milestone:  6.14.1                      
   Component:  Compiler (Type checker)                  |      Version:  6.12.3                      
    Keywords:  instance deriving, type families, GADTs  |     Testcase:                              
   Blockedby:                                           |   Difficulty:                              
          Os:  Linux                                    |     Blocking:                              
Architecture:  x86_64 (amd64)                           |      Failure:  Compile-time performance bug
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Changes (by igloo):

  * milestone:  => 6.14.1


Comment:

 Thanks for the report. HEAD has the same problem.

 `:i` gives information about how something it defined, whereas `:t` tells
 you what type it would be inferred to have as an expression.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4235#comment:1>
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