[GHC] #10868: Make GHC generics capable of handling unboxed types

[GHC]

#10868: Make GHC generics capable of handling unboxed types
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        Reporter:  RyanGlScott       |                Owner:  RyanGlScott
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8468             |  Differential Rev(s):  Phab:D1239
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"6cde981a8788b225819be28659caddc35b77972d/ghc" 6cde981/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6cde981a8788b225819be28659caddc35b77972d"
 Make GHC generics capable of handling unboxed types

 This adds a data family (`URec`) and six data family instances (`UAddr`,
 `UChar`, `UDouble`, `UFloat`, `UInt`, and `UWord`) which a `deriving
 Generic(1)` clause will generate if it sees `Addr#`, `Char#`, `Double#`,
 `Float#`, `Int#`, or `Word#`, respectively. The programmer can then
 provide instances for these data family instances to provide custom
 implementations for unboxed types, similar to how derived `Eq`, `Ord`,
 and `Show` instances currently special-case unboxed types.

 Fixes #10868.

 Test Plan: ./validate

 Reviewers: goldfire, dreixel, bgamari, austin, hvr, kosmikus

 Reviewed By: dreixel, kosmikus

 Subscribers: simonpj, thomie

 Differential Revision: https://phabricator.haskell.org/D1239

 GHC Trac Issues: #10868
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10868#comment:2>
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