[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:  closed
        Priority:  normal            |               Milestone:  7.10.1
       Component:  libraries/base    |                 Version:  7.6.3
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D407
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"d0cf8f1a41957a0d30475f7220facdec9efaa3a0/ghc" d0cf8f1/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d0cf8f1a41957a0d30475f7220facdec9efaa3a0"
 Testsuite: simplify T8089 (#8089)

 The previous implementation wasn't working for the `ghci` test way,
 causing a fulltest failure.

 Differential Revision: https://phabricator.haskell.org/D1075
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8089#comment:13>
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