[GHC] #10512: Generic instances missing for Int32, Word64 etc.

[GHC]

#10512: Generic instances missing for Int32, Word64 etc.
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        Reporter:  andreas.abel      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  7.10.1
      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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Changes (by RyanGlScott):

 * cc: ekmett (added)


Comment:

 > All I know is that when I tried to generate the Binary instances for my
 data types, I got the complaint about missing Generic instances for Int32
 and Word64.

 Really? I'm not sure why this would be the case, since in all of the
 examples I've seen, `Generic` instances don't require that a datatype's
 arguments also be `Generic`. For example, if you have this:

     {{{#!hs
     {-# LANGUAGE DeriveAnyClass, DeriveGeneric #-}
     data T = T Int32 Word64 deriving (Binary, Generic)
     }}}

 Then the generic machinery in `binary` only requires that `Int32` and
 `Word64` be `Binary` instances.

 Might I ask what your use case is? It seems ''very'' unlikely that we're
 going to be adding `Generic` instances for base types like these going
 forwards. In fact, we're going to
 [http://git.haskell.org/ghc.git/blobdiff/d4bcd05d7df3138429abdf43d3e3eb8f6da2dcdf..700c42b5e0ffd27884e6bdfa9a940e55449cff6f:/libraries/base/GHC/Generics.hs
 remove] the `Generic` instances for `Char`, `Double`, `Float`, and `Int`
 in GHC 8.0 for the reasons that Pedro and Ed described.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10512#comment:7>
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