[GHC] #12616: type synonyms confuse generalized newtype deriving role checking

[GHC]

#12616: type synonyms confuse generalized newtype deriving role checking
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        Reporter:  daviddarais       |                Owner:  goldfire
            Type:  bug               |               Status:  merge
        Priority:  low               |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  generalized
                                     |  newtype deriving roles rankntypes
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHC rejects       |            Test Case:
  valid program                      |  deriving/should_compile/T12616
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * milestone:   => 8.0.2


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12616#comment:4>
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