[GHC] #12457: Deriving should be (more closely) integrated with other metaprogramming methods

[GHC]

#12457: Deriving should be (more closely) integrated with other metaprogramming
methods
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        Reporter:  mpickering        |                Owner:
            Type:  feature request   |               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):

 Some prior art we can draw on: Rust 1.15 has a "custom derive" feature
 that let's you derive any trait using its macro system: https://doc.rust-
 lang.org/book/procedural-macros.html.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12457#comment:5>
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