[GHC] #10023: Relax Monad constraint in traceM and traceShowM to Applicative

[GHC]

#10023: Relax Monad constraint in traceM and traceShowM to Applicative
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        Reporter:  RyanGlScott       |                   Owner:
            Type:  feature request   |  RyanGlScott
        Priority:  normal            |                  Status:  new
       Component:  libraries/base    |               Milestone:  7.12.1
      Resolution:                    |                 Version:  7.10.1-rc1
Operating System:  Unknown/Multiple  |                Keywords:  newcomer
 Type of failure:  Other             |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:                    |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:  Phab:D1029
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"39d83f239d33b1d214bdb7f7b3ce94d76d3e1467/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="39d83f239d33b1d214bdb7f7b3ce94d76d3e1467"
 Generalize traceM, traceShowM (fixes #10023)

 This generalizes the type signatures of `traceM` and `traceShowM` to
 use `Applicative` rather than `Monad`.

 Reviewers: austin, ekmett, hvr, bgamari

 Reviewed By: ekmett, hvr, bgamari

 Subscribers: thomie, bgamari

 Differential Revision: https://phabricator.haskell.org/D1029

 GHC Trac Issues: #10023
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10023#comment:8>
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