#12423: Panic with DeriveAnyClass -------------------------------------+------------------------------------- Reporter: knrafto | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Generics Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #12144 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): I apologize, comment:3 is wrong in stating that you can't derive an `Eq1` instance for `Foo`. It is most certainly possible to–after all, you can create the following instance! {{{#!hs instance Eq1 Foo }}} That eta-reduction stuff was me confusing the details of `DeriveAnyClass` with other deriving mechanisms, like `GeneralizedNewtypeDeriving` and `DeriveFunctor`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12423#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler