[GHC] #13117: Derived functor instance for void types handles errors badly

[GHC]

#13117: Derived functor instance for void types handles errors badly
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        Reporter:  dfeuer            |                Owner:  dfeuer
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #7401, #10577     |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * related:  #7401 => #7401, #10577


Comment:

 Indeed. However, this ticket specifically concerns `Functor`, right? It
 might be best to tackle the other classes in #10577.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13117#comment:7>
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