[GHC] #10087: DefaultSignatures: error message mentions internal name

[GHC]

#10087: DefaultSignatures: error message mentions internal name
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        Reporter:  andreas.abel      |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.8.4
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  Other             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by dreixel):

 I agree that it's not a good idea to mention `$gdmreflexive` in the error
 message.

 But I don't think the error should be replaced by a warning. If there are
 no default signatures we don't get any errors or warnings:
 {{{
 class C a where
   reflexive :: Eq a => a -> Bool
   reflexive x = x == x

 data D

 instance C D
 }}}

 So perhaps that's what we should do in this case, too.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10087#comment:1>
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