[GHC] #10523: Add Monoid instance for IO

[GHC]

#10523: Add Monoid instance for IO
-------------------------------------+-------------------------------------
        Reporter:  Gabriel439        |                   Owner:  Gabriel439
            Type:  feature request   |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  libraries/base    |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D988
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"65d4b895d8331ff9e7df6aaf0a0de898c857201c/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="65d4b895d8331ff9e7df6aaf0a0de898c857201c"
 Add `Monoid` instance for `IO`

 See original proposal at
 https://mail.haskell.org/pipermail/libraries/2014-November/024310.html
 for more details

 Reviewed By: hvr, austin

 Differential Revision: https://phabricator.haskell.org/D988

 GHC Trac Issues: #10523
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10523#comment:4>
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