Re: [GHC] #11509: Incorrect error message in StandaloneDeriving: "The data constructors of <typeclass> are not all in scope"

#11509: Incorrect error message in StandaloneDeriving: "The data constructors of <typeclass> are not all in scope" -------------------------------------+------------------------------------- Reporter: edsko | Owner: RyanGlScott Type: bug | Status: patch Priority: normal | Milestone: Component: Compiler | Version: 8.0.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D2558 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari ): In [changeset:"23cf32da76fe6ed29fa141047749d390df763f94/ghc" 23cf32da/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="23cf32da76fe6ed29fa141047749d390df763f94" Disallow standalone deriving declarations involving unboxed tuples or sums There was an awful leak where GHC permitted standalone `deriving` declarations to create instances for unboxed sum or tuple types. This fortifies the checks that GHC performs to catch this scenario and give an appropriate error message. Fixes #11509. Test Plan: ./validate Reviewers: goldfire, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2557 GHC Trac Issues: #11509 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11509#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler