[GHC] #1311: newtypes of unboxed types disallowed - documentation bug and/or feature request

[GHC]

#1311: newtypes of unboxed types disallowed - documentation bug and/or feature
request
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        Reporter:  Isaac Dupree      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:  ⊥
       Component:  Compiler          |              Version:  7.7
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I see no difficulty in principle, and I don’t think this would be too hard
 in practice.  That is, you can give a new name (via newtype) to an
 unlifted type like `Int#`, `Float#`, `Double#` etc.

 Consequences:
  * newtypes might have kind `#` (unlifted)
  * The `Coercible` class would have to work over unlifted types

 See [https://mail.haskell.org/pipermail/ghc-devs/2015-December/010840.html
 email thread]

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1311#comment:8>
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