#13990: Core Lint error on empty case -------------------------------------+------------------------------------- Reporter: mbieleck | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.2 Component: Compiler | Version: 8.2.1-rc3 Resolution: | Keywords: core-lint | case Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata): The cleanest solution might be: * extend `CoreUtils.filterAlts` to filter out impossible alternatives, i.e. constructors with fields with an empty type and a bang pattern. This code already filters out constructors that are impossible for other reasons. * extend `CoreLint` to not complain when a `case` is empty for this particular reason. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13990#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler