[GHC] #9153: TcCoercible test is failing with context reduction stack overflow

[GHC]

#9153: TcCoercible test is failing with context reduction stack overflow
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        Reporter:  ezyang            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  low               |        Milestone:
       Component:  Test Suite        |          Version:  7.9
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 This must be collateral damage from #9117
 ([changeset:7e78faf033405bd5f3b6b787343c98e33d767bda/ghc], I just wonder
 it validated for me back then... I’m rebuilding my tree to find out.

 The discussion which behaviour is better (around [ticket:9117#comment:21])
 concluded that recursive newtypes are going to be treated novercally, and
 otherwise the new behaviour is better.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9153#comment:1>
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