[GHC] #10487: DeriveGeneric breaks when the same data name is used in different modules

[GHC]

#10487: DeriveGeneric breaks when the same data name is used in different modules
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        Reporter:  andreas.abel      |                   Owner:  osa1
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1081
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Comment (by osa1):

 I don't think they're user visible, because for example if I load the file
 in GHCi I can't see those types there(although I must say I don't know how
 this is possible to implement, I'd expect everything in that module to be
 visible).

 I'll have a look at `TcEnv.newDFunName`, it sounds like a great idea.

 Is there a ticket for the clean up task?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10487#comment:13>
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