[GHC] #10773: Add Control.Monad.IO.Class from transformers to base

[GHC]

#10773: Add Control.Monad.IO.Class from transformers to base
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              Reporter:              |             Owner:  ekmett
  RyanGlScott                        |
                  Type:  feature     |            Status:  new
  request                            |
              Priority:  normal      |         Milestone:
             Component:  Core        |           Version:  7.10.2
  Libraries                          |
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 (As proposed in a Haskell libraries mailing list thread
 [https://mail.haskell.org/pipermail/libraries/2015-July/026008.html
 here]).

 This Trac issue addresses one of the two suggestions made in the proposal,
 i.e., moving `Control.Monad.IO.Class` from `transformers` to `base`. (The
 second, introducing a `MonadIO Q` instance in `template-haskell`, can be
 dealt with depending on the result of this.)

 Conceptually, this change is very similar in spirit to #9664—the `MonadIO`
 class is a Haskell98 typeclass that has proven to be widely useful in
 abstracting `IO`-based functions into a type signature that can be used
 with monad transformer stacks. Moving `MonadIO`'s module into `base` would
 allow more widespread use without incurring a `transformers` dependency,
 and it could provide a first step for generalizing more `base` functions
 from `IO` to `MonadIO`.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10773>
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