#9072: RankNTypes composition now requires ImpredicativeTypes ----------------------------------------------+---------------------------- Reporter: gelisam | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler (Type checker) | Version: 7.8.2 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects valid program | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------------+---------------------------- Changes (by simonpj): * status: new => closed * resolution: => invalid Comment: This is, I guess, a bug in 7.6. You really do need impredicative instantiation for the application of `(.)` to work. So I don't think this is a bug in 7.8. Yell if you disagree. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9072#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler