[GHC] #15526: Explain or remove mystery import in Unsafe.Coerce

[GHC]

#15526: Explain or remove mystery import in Unsafe.Coerce
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Core Libraries    |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 There are a handful of other places that have similarly vague comments
 (without references to Notes), such as `GHC.Maybe`, `GHC.Stack.Types`, and
 `GHC.Err`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15526#comment:3>
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