[GHC] #8671: Rebindable syntax creates bogus warning

[GHC]

#8671: Rebindable syntax creates bogus warning
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        Reporter:  thomaseding                   |            Owner:
            Type:  bug                           |           Status:  new
        Priority:  normal                        |        Milestone:
       Component:  Compiler                      |          Version:  7.6.3
      Resolution:                                |         Keywords:
Operating System:  Windows                       |     Architecture:
 Type of failure:  Incorrect warning at          |  Unknown/Multiple
  compile-time                                   |       Difficulty:
       Test Case:                                |  Unknown
        Blocking:                                |       Blocked By:
                                                 |  Related Tickets:
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Comment (by thomaseding):

 I'd be fine with simply having the warning suppressed in that case.

 Though I could see the warning be useful for rebound do-notation where it
 makes sense (e.g. monads that have restrictions on their kinds http://blog
 .omega-prime.co.uk/?p=127).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8671#comment:2>
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