[GHC] #9220: type roles for unboxed arrays

[GHC]

#9220: type roles for unboxed arrays
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        Reporter:  rwbarton           |            Owner:
            Type:  bug                |           Status:  new
        Priority:  normal             |        Milestone:
       Component:  libraries (other)  |          Version:  7.8.1
      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 goldfire):

 This is an area (arrays in Haskell) I know little about. How does this
 request compare to #9163, asking for `Ptr` to have a phantom role? Perhaps
 the difference is that `Ptr` refers to foreign objects but arrays store
 proper Haskell values? Sorry -- just not terribly familiar over here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9220#comment:1>
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