[GHC] #13178: Generalize type of runRW#

[GHC]

#13178: Generalize type of runRW#
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        Reporter:  dfeuer            |                Owner:  dfeuer
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3012
       Wiki Page:                    |
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Comment (by David Feuer <David.Feuer@…>):

 In [changeset:"c344005b2344800bee9fee1c5ca97867691b9c70/ghc"
 c344005b/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="c344005b2344800bee9fee1c5ca97867691b9c70"
 Generalize the type of runRW#

 * Generalize the type of `runRW#` to allow arbitrary return types.

 * Use `runRW#` to implement `Control.Monad.ST.Lazy.runST` (this
 provides evidence that it actually works properly with the generalized
 type).

 * Adjust the type signature in the definition of `oneShot` to match
 the one it is given in `MkId`.

 Reviewers: simonmar, austin, bgamari, hvr

 Reviewed By: bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D3012

 GHC Trac Issues: #13178
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13178#comment:6>
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