Re: [GHC] #14094: DeriveAnyClass doesn't warn about unimplemented type families

#14094: DeriveAnyClass doesn't warn about unimplemented type families -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: RyanGlScott Type: bug | Status: patch Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: deriving Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3828 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ryan Scott ): In [changeset:"3f05e5f6becc2f7174898726b6f027105b12a780/ghc" 3f05e5f6/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="3f05e5f6becc2f7174898726b6f027105b12a780" Don't suppress unimplemented type family warnings with DeriveAnyClass Summary: For some asinine reason, we were suppressing warnings when deriving associated type family instances with `DeriveAnyClass`. That seems like a bad idea. Let's not do that. Along the way, I noticed that the error contexts associated with these newly emitted warnings were less than ideal, so I did some minor refactoring to improve the story there. Fixes #14094 Test Plan: ./validate Reviewers: bgamari, austin Subscribers: rwbarton, thomie GHC Trac Issues: #14094 Differential Revision: https://phabricator.haskell.org/D3828 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14094#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler