[GHC] #11210: Missing instances for Identity and Const

[GHC]

#11210: Missing instances for Identity and Const
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           Reporter:  duairc         |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  7.11
  libraries/base                     |
           Keywords:  g              |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The following instances are all permissible yet are not defined. They can
 all be derived with {{{GeneralizedNewtypeDeriving}}}. It would be useful
 for me if they were defined in {{{base}}}. These should probably also go
 into {{{base-orphans}}} and {{{transformers}}} (for versions of {{{base}}}
 before {{{Identity}}} was moved there).

 {{{#!hs
 instance Bounded a => Bounded (Const a b)
 instance Enum a => Bounded (Const a b)
 instance Ix a => Bounded (Const a b)
 instance Semigroup a => Semigroup (Const a b)

 instance Bounded a => Bounded (Identity a)
 instance Enum a => Bounded (Identity a)
 instance Ix a => Bounded (Identity a)
 instance Semigroup a => Semigroup (Identity a)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11210>
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