[GHC] #7878: Panic when using DerivingGeneric with hs-boot

[GHC]

#7878: Panic when using DerivingGeneric with hs-boot
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    Reporter:  ryant5000       |       Owner:  dreixel           
        Type:  bug             |      Status:  patch             
    Priority:  normal          |   Milestone:                    
   Component:  Compiler        |     Version:  7.7               
    Keywords:                  |          Os:  Linux             
Architecture:  x86_64 (amd64)  |     Failure:  Compile-time crash
  Difficulty:  Unknown         |    Testcase:                    
   Blockedby:                  |    Blocking:                    
     Related:                  |  
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Changes (by parcs):

  * status:  new => patch


Comment:

 I think I have a solution (attached): `genGenericMetaTyCons` creates new
 top-level external names but it doesn't populate the name cache with them.
 Creating the names with `newGlobalBinder`, which in turn updates the name
 cache, fixes this issue (and still passes the testsuite). Though I don't
 know whether this is the correct solution.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7878#comment:4>
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