[GHC] #8089: Implementation of GHC.Event.Poll.poll is broken due to bad coercion

[GHC]

#8089: Implementation of GHC.Event.Poll.poll is broken due to bad coercion
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              Reporter:  merijn      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:              |          Version:  7.6.3
  libraries/base                     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:  Runtime     |       Blocked By:
  crash                              |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"24e05f48f3a3a1130ecd5a46e3089b76ee5a2304/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="24e05f48f3a3a1130ecd5a46e3089b76ee5a2304"
 *Really*, really fix RTS crash due to bad coercion.

 Summary:
 My previous attempt to fix the new coercion bug introduced by my fix
 actually
 just reverted back to the *old* bug. This time it should properly handle
 all
 three size scenarios.

 Signed-off-by: Merijn Verstraaten <merijn at inconsistent.nl>

 Test Plan: validate

 Reviewers: dfeuer, austin, hvr

 Reviewed By: austin, hvr

 Subscribers: thomie, carter, simonmar

 Differential Revision: https://phabricator.haskell.org/D407

 GHC Trac Issues: #8089
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8089#comment:9>
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