#13955: Backpack does not handle unlifted types -------------------------------------+------------------------------------- Reporter: andrewthad | Owner: (none) Type: feature request | Status: new Priority: low | Milestone: Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: backpack | LevityPolymorphism Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari <ben@…>): In [changeset:"fd8b044e9664181d4815e48e8f83be78bc9fe8d2/ghc" fd8b044e/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="fd8b044e9664181d4815e48e8f83be78bc9fe8d2" Levity polymorphic Backpack. This patch makes it possible to specify non * kinds of abstract data types in signatures, so you can have levity polymorphism through Backpack, without the runtime representation constraint! Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu> Test Plan: validate Reviewers: andrewthad, bgamari, austin, goldfire Reviewed By: bgamari Subscribers: goldfire, rwbarton, thomie GHC Trac Issues: #13955 Differential Revision: https://phabricator.haskell.org/D3825 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13955#comment:6> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler