#15622: Generalize `E{0,1,2,3,6,9,12}` from `Data.Fixed` -------------------------------------+------------------------------------- Reporter: rockbmb | Owner: rockbmb Type: feature request | Status: new Priority: normal | Milestone: 8.6.1 Component: Core Libraries | Version: 8.4.3 Resolution: | Keywords: base, | Data.Fixed Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): That is still a breaking change, since it changes `E0`, `E1`, etc. from data types to type synonyms. Among other things, this will cause programs that declare instances against these types to stop compiling if they do not enable the `FlexibleInstances` extension. That change notwithstanding, I would also be interested to hear the community's feedback on the use of the `DataKinds` GHC extension in a prominent place in `base` like `Data.Fixed`. (`DataKinds` is already used in other places in `base`, but they're mostly sectioned off within the `GHC.*` namespace, where language extension experimentation is more readily tolerated.) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15622#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler