#9429: Alternative to type family Any -------------------------------------+------------------------------------- Reporter: mboes | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.9 Component: Compiler | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: 9097, 9380 None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonpj): I'm a bit lost in this thread. As Richard says (comment:17), * `Any` is still a valid type that can inhabit any kind * but you can't pattern-match on it in an instance declaration There are good reasons for this design. One that has not been mentioned so far is #7259: eta expansion of products. Admittedly we don't have this now, but in some sense we should have, and I'd be reluctant to move to a design that precluded it. If there is still a lack, could someone articulate just what it is, preferably explicitly (articulating problem, solution) rather than by saying that `rank1dyanamic` doesn't work. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9429#comment:19 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler