[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:  closed
        Priority:  low               |        Milestone:
       Component:  Test Suite        |          Version:  7.9
      Resolution:  fixed             |         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 simonpj):

 Just to be clear, the relevant test is this:
 {{{
 newtype FixEither a = FixEither (Either a (FixEither a)) deriving Show

 -- And then try
 --   Coercible (FixEither Age) (Either Int  (FixEither Int))
 --   Coercible (Either Int (FixEither Age)) (FixEither Age)
 }}}
 It is entirely moot whether these two "should" work or not.  But #9117
 suggests not.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9153#comment:4>
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