[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:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:  duplicate         |             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):

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


Comment:

 Please ignore what I wrote in comment:2, that is utter garbage. The real,
 //real// cause of what was going on is much simpler: it is indeed a
 duplicate of #12245. The reason that alanz hit this bug when building
 ​https://github.com/ghc/ghc/tree/wip/new-tree-one-param-2 was simply
 because he was bootstrapping with GHC 8.0.2, and the fix for #12245 didn't
 land until GHC 8.2.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13759#comment:3>
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