[GHC] #15653: Both `Ptr a` in SerializedCompact are inaccurate because of the `a`

[GHC]

#15653: Both `Ptr a` in SerializedCompact are inaccurate because of the `a`
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        Reporter:  chessai           |                Owner:  ezyang
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:                    |              Version:  8.4.3
  libraries/compact                  |             Keywords:  ghc-compact,
      Resolution:                    |  compact regions
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect API     |  Unknown/Multiple
  annotation                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 I think it would be quite reasonable to fix this. In my view we should try
 quite hard to ensure unsafe interfaces like that of `Ptr` are made as safe
 as possible.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15653#comment:1>
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