[GHC] #9813: Error when reifying type constructor

[GHC]

#9813: Error when reifying type constructor
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        Reporter:  owst              |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              Version:  7.8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1899
       Wiki Page:                    |
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Comment (by rwbarton):

 I think this is too optimistic. In general we can't analyze the argument
 of `reify` in `g` to know that it refers only to `f`. Plus the `...` could
 contain arbitrary code that could use functions in other packages that
 reify arbitrary names.

 I would say that both `f` and `g` can only refer to `h`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9813#comment:19>
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