#13594: Typechecker behavior w.r.t. BangPatterns and nested foralls has changed in 8.2 -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.2.1-rc2 checker) | Keywords: BangPatterns, Resolution: | RankNTypes Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3525 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari <ben@…>): In [changeset:"372995364c52eef15066132d7d1ea8b6760034e6/ghc" 37299536/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="372995364c52eef15066132d7d1ea8b6760034e6" Treat banged bindings as FunBinds This reworks the HsSyn representation to make banged variable patterns (e.g. !x = e) be represented as FunBinds instead of PatBinds, adding a flag to FunRhs to record the bang. Fixes #13594. Reviewers: austin, goldfire, alanz, simonpj Reviewed By: simonpj Subscribers: simonpj, rwbarton, thomie, mpickering Differential Revision: https://phabricator.haskell.org/D3525 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13594#comment:9> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler