[GHC] #8904: haddock displays GHC.Types.Coercible as a datatype

[GHC]

#8904: haddock displays GHC.Types.Coercible as a datatype
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        Reporter:  nomeata           |            Owner:
            Type:  bug               |           Status:  new
        Priority:  low               |        Milestone:
       Component:  GHC API           |          Version:  7.9
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 It’s in `ghc-prim`, not in base, if that helps :-) Otherwise, no: You need
 something that exports a datatype that GHC internally turns into a
 constraint, nothing you can have separate of GHC and ghc-prim, I think.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8904#comment:2>
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