[GHC] #8745: GeneralizedNewtypeDeriving is still not Safe

[GHC]

#8745: GeneralizedNewtypeDeriving is still not Safe
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        Reporter:  goldfire                      |            Owner:
            Type:  bug                           |           Status:
        Priority:  normal                        |  closed
       Component:  Compiler                      |        Milestone:  7.8.1
      Resolution:  fixed                         |          Version:
Operating System:  Unknown/Multiple              |  7.8.1-rc1
 Type of failure:  None/Unknown                  |         Keywords:  Safe
       Test Case:                                |     Architecture:
  should_fail/TcCoercibleFailSafe                |  Unknown/Multiple
        Blocking:                                |       Difficulty:
                                                 |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Comment (by simonpj):

 Don't miss the long discussion in #8827

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8745#comment:27>
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