[GHC] #11790: (More) missing instances for Identity and Const

[GHC]

#11790: (More) missing instances for Identity and Const
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        Reporter:  duairc            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2079
       Wiki Page:                    |
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Changes (by bgamari):

 * cc: core-libraries-committe (added)
 * type:  bug => feature request


@@ -6,1 +6,1 @@
- {{{
+ {{{#!hs

New description:

 I made a similar ([https://ghc.haskell.org/trac/ghc/ticket/11210 #11210])
 issue a few months ago and submitted a
 [https://phabricator.haskell.org/D1626 patch] which was accepted. There
 are some more instances I want to add:

 {{{#!hs

 instance Num a => Num (Identity a)
 instance Real a => Real (Identity a)
 instance Integral a => Integral (Identity a)
 instance Fractional a => Fractional (Identity a)
 instance Floating a => Floating (Identity a)
 instance RealFrac a => RealFrac (Identity a)
 instance RealFloat a => RealFloat (Identity a)
 instance Bits a => Bits (Identity a)
 instance FiniteBits a => FiniteBits (Identity a)
 instance IsString => IsString (Identity a)

 instance Num a => Num (Const a b)
 instance Real a => Real (Const a b)
 instance Integral a => Integral (Const a b)
 instance Fractional a => Fractional (Const a b)
 instance Floating a => Floating (Const a b)
 instance RealFrac a => RealFrac (Const a b)
 instance RealFloat a => RealFloat (Const a b)
 instance Bits a => Bits (Const a b)
 instance FiniteBits a => FiniteBits (Const a b)
 instance IsString => IsString (Const a b)
 }}}

--

Comment:

 It would be nice to get approval from the CLC on this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11790#comment:2>
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