[GHC] #14107: Implement Semigroup and Monoid instances for the ST monad

[GHC]

#14107: Implement Semigroup and Monoid instances for the ST monad
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        Reporter:  plato             |                Owner:  (none)
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.2.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3845
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"441c52de0621ac68a2248cf691b4de31fba48a34/ghc" 441c52d/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="441c52de0621ac68a2248cf691b4de31fba48a34"
 Add Semigroup/Monoid instances to ST monad

 Fixes #14107.

 Signed-off-by: Philipp Middendorf <middendorf at plapadoo.de>

 Reviewers: austin, hvr, bgamari, RyanGlScott

 Reviewed By: bgamari

 Subscribers: RyanGlScott, rwbarton, thomie

 GHC Trac Issues: #14107

 Differential Revision: https://phabricator.haskell.org/D3845
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14107#comment:6>
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