[GHC] #9163: Ptr should have a phantom role

[GHC]

#9163: Ptr should have a phantom role
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        Reporter:  simonpj           |            Owner:  goldfire
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #9164
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Changes (by goldfire):

 * owner:   => goldfire


Comment:

 As noted previously, `FunPtr`'s roles are a little fiddlier. I'll take
 this one, and add a bunch of comments while I'm at it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9163#comment:23>
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