[GHC] #8668: SPECIALIZE silently fails to apply

[GHC]

#8668: SPECIALIZE silently fails to apply
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        Reporter:  crockeea          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by carter):

 did you try doing a specialize on

  (FastCyc (VT U.Vector m) Int) -> (FastCyc (VT U.Vector m) Int) ->
 (FastCyc (VT U.Vector m) Int)

 without the class constraint?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8668#comment:10>
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