[GHC] #5412: dataTypeConstrs gives unhelpful error message

[GHC]

#5412: dataTypeConstrs gives unhelpful error message
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        Reporter:  NeilMitchell      |            Owner:  klangner
            Type:  bug               |           Status:  patch
        Priority:  normal            |        Milestone:  7.6.2
       Component:  libraries/base    |          Version:  7.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 Go for 3! The message will always be of the kind „Data.Data.... is not
 supported for ..., as it is not ...“

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5412#comment:13>
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