[GHC] #9117: Coercible constraint solver misses one

[GHC]

#9117: Coercible constraint solver misses one
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        Reporter:  goldfire          |            Owner:  nomeata
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      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 Joachim Breitner <mail@…>):

 In [changeset:"94c57676d7f88cd9edcc522aa3dc3ec6e3ad6633/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="94c57676d7f88cd9edcc522aa3dc3ec6e3ad6633"
 Coercible: Test case for now broken(?) corner case

 involving a non-terminating newtype. This worked before 7e78faf03.
 Probably not a problem, but still better to have a test case for it. See
 ticket #9117.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9117#comment:18>
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