[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 request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.11
      Resolution:                    |             Keywords:  g
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1626
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"2dff6c184f97fa564c72c73374378a65e12984d8/ghc"
 2dff6c18/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="2dff6c184f97fa564c72c73374378a65e12984d8"
 Added missing instances for Identity and Const (#11210)

 The following instances are added

     instance Bounded a => Bounded (Const a b)
     instance Enum a => Enum (Const a b)
     instance Ix a => Ix (Const a b)
     instance Storable a => Storable (Const a b)

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

 Reviewers: ekmett, RyanGlScott, rwbarton, hvr, austin, bgamari

 Reviewed By: RyanGlScott, hvr

 Subscribers: rwbarton, RyanGlScott, thomie

 Differential Revision: https://phabricator.haskell.org/D1626

 GHC Trac Issues: #11210
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11210#comment:6>
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