[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
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * status:  new => patch
 * differential:   => Phab:D988


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10523#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler