Re: [GHC] #11305: Type checker regression introduced by visible type-application

#11305: Type checker regression introduced by visible type-application -------------------------------------+------------------------------------- Reporter: hvr | Owner: goldfire Type: bug | Status: patch Priority: highest | Milestone: 8.0.1 Component: Compiler (Type | Version: 7.11 checker) | Resolution: | Keywords: regression Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: | typecheck/should_compile/T11305 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1715 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Richard Eisenberg ): In [changeset:"c06b46d0313cafe05f8250a660b4481d7c1d298f/ghc" c06b46d/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="c06b46d0313cafe05f8250a660b4481d7c1d298f" Fix #11305. Summary: In the fallthrough case when doing a subsumption case, we need to deeply instantiate to remove any buried foralls in the "actual" type. Once this validates, please feel free to commit it; I may not have the chance to do this on Tuesday. Back in full action on Wed. Test Plan: ./validate, typecheck/should_compiler/T11305 Reviewers: austin, bgamari, hvr Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1715 GHC Trac Issues: #11305 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11305#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler