#15073: Unable to newtype derive `Prim` via DerivingStrategies -------------------------------------+------------------------------------- Reporter: fosskers | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: deriving Operating System: Unknown/Multiple | Architecture: x86_64 | (amd64) Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4620, Wiki Page: | Phab:D4701 -------------------------------------+------------------------------------- Comment (by Ben Gamari <ben@…>): In [changeset:"b876c1bb5c8ccd73a203c0f94bac3cbb9c7e2d65/ghc" b876c1bb/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="b876c1bb5c8ccd73a203c0f94bac3cbb9c7e2d65" users-guide: Point out GNTD may require additional extensions As noted in #15073, GeneralizedNewtypeDeriving may produce code that uses extensions that do not directly appear in the code written by the user. Make this clear in the users guide. [skip ci] Test Plan: Read it Reviewers: RyanGlScott Reviewed By: RyanGlScott Subscribers: fosskers, rwbarton, thomie, carter GHC Trac Issues: #15073 Differential Revision: https://phabricator.haskell.org/D4701 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15073#comment:10> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler