[GHC] #13403: Derive instances (Applicative, Monad, ...) for structures lifted over functors

[GHC]

#13403: Derive instances (Applicative, Monad, ...) for structures lifted over
functors
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       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:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Replying to [comment:3 Iceland_jack]:
 > At least it incites a reaction :) the proposal was but we can go into
 the direction of [https://hackage.haskell.org/package/base-4.9.1.0/docs
 /GHC-Generics.html#t:Rep Generic's Rep]

 Funny enough, I was going recommend exactly `GHC.Generics` as a solution
 to your problem. It gives you the power to exclude awkward subsets of
 datatypes (e.g., no `Monad` instances for `Compose`-like things), and it
 requires no changes to GHC.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13403#comment:4>
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