#10873: Bad error message for incorrect pattern synonym signature -------------------------------------+------------------------------------- Reporter: mpickering | Owner: rdragon Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler (Type | Version: 7.10.2 checker) | Keywords: Resolution: | PatternSynonyms Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1866 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari <ben@…>): In [changeset:"116528c8429257a0ae855251fd266547bb23d01d/ghc" 116528c/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="116528c8429257a0ae855251fd266547bb23d01d" Improve pattern synonym error messages (add `PatSynOrigin`) Adds a new data constructor `PatSynOrigin Bool Name` to the `CtOrigin` data type. This allows for better error messages when the origin of a wanted constraint is a pattern synonym declaration. Fixes T10873. Reviewers: mpickering, simonpj, austin, thomie, bgamari Reviewed By: simonpj, thomie, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1866 GHC Trac Issues: #10873 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10873#comment:10> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler