Re: [GHC] #9984: Show, Read, Eq, Ord instances for Control.Applicative.Const

#9984: Show, Read, Eq, Ord instances for Control.Applicative.Const -------------------------------------+------------------------------------- Reporter: fumieval | Owner: Type: feature request | Status: patch Priority: low | Milestone: 7.10.1 Component: libraries/base | Version: 7.8.4 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: Phab:D619 -------------------------------------+------------------------------------- Comment (by Herbert Valerio Riedel ): In [changeset:"c71fb84b8c9ec9c1e279df8c75ceb8a537801aa1/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="c71fb84b8c9ec9c1e279df8c75ceb8a537801aa1" Add Eq, Ord, Show, and Read instances for Const As suggested in https://www.haskell.org/pipermail/libraries/2013-October/021531.html this adds the following instances - `Show a => Show (Const a b)` - `Read a => Read (Const a b)` - `Eq a => Eq (Const a b)` - `Ord a => Ord (Const a b)` The Read/Show instances are defined in such a way as if `Const` was defined without record-syntax (i.e. as `newtype Const a b = Const a`) Addresses #9984 Reviewed By: ekmett Differential Revision: https://phabricator.haskell.org/D619 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9984#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler