[GHC] #8773: Require -XIncoherentInstances to write role annotations on class definitions

[GHC]

#8773: Require -XIncoherentInstances to write role annotations on class
definitions
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        Reporter:  goldfire          |            Owner:  goldfire
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.1-rc1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #8745
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Changes (by nomeata):

 * cc: mail@… (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8773#comment:1>
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