[GHC] #13759: Strange error message for deriving Data

[GHC]

#13759: Strange error message for deriving Data
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        Reporter:  alanz             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12245            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * related:   => #12245


Comment:

 I'm not sure what changes you did on your local branch to make this fail,
 but on GHC HEAD (as of commit 09d5c993aae208e3d34a9e715297922b6ea42b3f),
 that program typechecks.

 Do you have commit 895eefa8447a2886e77fdedcbca8047263c88db7 (Make unique
 auxiliary function names in deriving) in your local branch? That's what
 fixed #12245, which I would consider this ticket to be a duplicate of.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13759#comment:1>
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