[GHC] #14975: Refactor (Maybe Coercion)

[GHC]

#14975: Refactor (Maybe Coercion)
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        Reporter:  tdammers          |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11735            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by tdammers):

 Turns out there are a few places in the code that exploit `Maybe`'s
 `Monad` instance (using `do` notation). I'll keep those as `Maybe` for now
 and see where I end up.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14975#comment:4>
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