[GHC] #12780: Calling "do nothing" type checker plugin affects type checking when it shouldn't

[GHC]

#12780: Calling "do nothing" type checker plugin affects type checking when it
shouldn't
-------------------------------------+-------------------------------------
        Reporter:  clinton           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  TypeCheckerPlugins
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11525            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by adamgundry):

 * keywords:   => TypeCheckerPlugins


Comment:

 This is fixed in 8.2.1 and later, I think?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12780#comment:5>
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