[GHC] #4154: Deadlock in Chan module

[GHC]

#4154: Deadlock in Chan module
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        Reporter:  NeilMitchell      |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  high              |            Milestone:  7.0.1
       Component:  libraries/base    |              Version:  6.12.3
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 It's been 7 years since `isEmptyChan` and `unGetChan` was deprecated
 (first release with deprecation seems to be 7.0). Should we delete them
 now?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4154#comment:7>
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