[GHC] #10640: Document prim-ops

[GHC]

#10640: Document prim-ops
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Documentation     |              Version:  7.10.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1082
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"244602697c30e03ba63076941e4742ceeb78dd7c/ghc" 2446026/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="244602697c30e03ba63076941e4742ceeb78dd7c"
 Document mkWeak#

 Reviewers: simonmar, austin

 Reviewed By: simonmar

 Subscribers: RyanGlScott, rwbarton, thomie

 GHC Trac Issues: #10640, #13611

 Differential Revision: https://phabricator.haskell.org/D3498
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10640#comment:10>
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