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

[GHC]

#9163: Ptr should have a phantom role
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        Reporter:  simonpj           |            Owner:
            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:
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Comment (by simonpj):

 Well regardless of the decision about the role of `Ptr`, what you describe
 sounds like an improvement anyway, getting rid of (always suspicious)
 `castPtr` calls.  If you grep in the base library you'll find quite a few
 others.  Can you eliminate them in the same way?

 I think this would be a nice improvement, if you cared to push it through.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9163#comment:9>
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