#9664: Add identity functor to base -------------------------------------+------------------------------------- Reporter: hvr | Owner: ekmett Type: task | Status: patch Priority: normal | Milestone: 7.10.1 Component: Core | Version: Libraries | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Easy (less than 1 Unknown/Multiple | hour) Type of failure: | Blocked By: None/Unknown | Related Tickets: Test Case: | Blocking: | Differential Revisions: Phab:D313 | -------------------------------------+------------------------------------- Comment (by hvr): @ross, I noticed you already reversed the Identity<->Class import-dependency in recent `transformers` commmits I've adapted http://git.haskell.org/packages/transformers.git/commitdiff/refs/heads/wip/T... which is now a rather minimal change to `transformers` (i.e. moving the `Identity.hs` file into a different source folder, and adapting `.cabal`) You write you "like to avoid a release with conditional exports". What problems do you anticipate that could occur by making use of such a conditional (non)export of `Data.Functor.Identity`? Specifically, I used `impl(ghc>=7.9)` instead of Cabal flags in order to avoid any Cabal-related problems I could think of. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9664#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler