[GHC] #13782: Bullish use of Template Haskell's newName causes GHC internal error

[GHC]

#13782: Bullish use of Template Haskell's newName causes GHC internal error
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        Reporter:  RyanGlScott       |                Owner:  carlostome
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Template Haskell  |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12503            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * cc: goldfire (added)
 * differential:  Phab:D3641 =>


Comment:

 Yes, I think you are right. For some undocumented reason, Richard, you
 changed this function to manipulate
 {{{
 data FreeKiTyVars = FKTV { fktv_kis    :: [Located RdrName]
                          , _fktv_k_set :: OccSet  -- for efficiency,
                                                   -- only used internally
                          , fktv_tys    :: [Located RdrName]
                          , _fktv_t_set :: OccSet
                          , fktv_all    :: [Located RdrName] }
 }}}
 instead of just the `fktv_kis` and `fktv_tys` pair which it used before.
 Moreover you switched to using `OccNames` for equality rather than
 `RdrNames`.

 Might you fix?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13782#comment:6>
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