[GHC] #5362: ghc: panic! mkUsageInfo: internal name? constr_a2Py{v}

[GHC]

#5362: ghc: panic! mkUsageInfo: internal name? constr_a2Py{v}
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    Reporter:  markwright         |        Owner:                                                   
        Type:  bug                |       Status:  new                                              
    Priority:  highest            |    Milestone:  7.2.1                                            
   Component:  Template Haskell   |      Version:  7.1                                              
    Keywords:  panic mkUsageInfo  |     Testcase:  http://hackage.haskell.org/package/syb-with-class
   Blockedby:                     |   Difficulty:                                                   
          Os:  Linux              |     Blocking:                                                   
Architecture:  x86_64 (amd64)     |      Failure:  Compile-time crash                               
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Comment(by simonpj):

 Ian in your test case, what is the ''problem'''.  It compiles fine for me.
 no `mkUsageInfo` errors.  Can you be more explicit about how to reproduce
 the error?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5362#comment:4>
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