[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:  8.0.1
       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 Edward Z. Yang <ezyang@…>):

 In [changeset:"b08a533dc87423a75bce037eb403d7828d3330d3/ghc" b08a533/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b08a533dc87423a75bce037eb403d7828d3330d3"
 Fix DeriveGeneric for types with same OccName (#10487)

 Summary:
 DeriveGeneric generates some data types (for data type constructors and
 for
 selectors of those constructors) and instances for those types. This patch
 changes name generation for these new types to make it working with data
 types
 with same names imported from different modules and with data types with
 same
 names imported from same modules(using module imports).

 Bonus content:

 - Some refactoring in `TcGenGenerics.metaTyConsToDerivStuff` to remove
 some
   redundant partial function applications and to remove a duplicated
 function.
 - Remove some unused names from `OccName`. (those were used for an old
   implementation of `DeriveGeneric`)

 Reviewers: kosmikus, simonpj, dreixel, ezyang, bgamari, austin

 Reviewed By: bgamari, austin

 Subscribers: ezyang, thomie

 Differential Revision: https://phabricator.haskell.org/D1081

 GHC Trac Issues: #10487
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10487#comment:18>
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