[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:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  7.10.3
  libraries/base                     |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):  D2079          |         Wiki Page:
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 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:

 {{{

 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)
 }}}

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