#10607: Auto derive from top to bottom -------------------------------------+------------------------------------- Reporter: songzh | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.11 Resolution: | Keywords: deriving, | typeclass, auto Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #13324 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by songzh): Dear All I am very happy to announce that I released `derive-topdown-0.0.0.9`. I tested with `Info` type in `template-haskell` and `HsModule` type in `haskell-src`. It can derive class instances for most common cases I think. It also can be used with other type classes with template Haskell deriving mechanism via a function with type `Name -> Q [Dec]`. I also considered `DerivingStrategies` in GHC 8.2. Please try it if you are interested. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10607#comment:21 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler