[GHC] #8658: Document Proxy#

[GHC]

#8658: Document Proxy#
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       Reporter:  goldfire          |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Documentation     |           Version:  7.7
       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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 Commit
 [https://github.com/ghc/ghc/commit/17112084f87d7ccebf639068b85948190d52c6ba
 17112084f87d7ccebf639068b85948190d52c6ba] introduced a new type `Proxy#`
 to `GHC.Prim`. However, I don't see any documentation for this type in the
 `GHC.Prim` haddock docs, or anywhere else. We should add this.

 A little poking around tells me that `compiler/prelude/primops.txt.pp` is
 the place to do it. But, I'm not familiar with that file's syntax, nor am
 I 100% familiar with `Proxy#`, so I don't think I'm the one to do it.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8658>
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