#12987: Core lint error with levity polymorphism -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: | 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 RyanGlScott): I can reproduce this in GHC 8.0.2, but not in GHC HEAD: {{{ $ inplace/bin/ghc-stage2 --interactive GHCi, version 8.1.20161215: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/rgscott/.ghci λ> import GHC.Types λ> :set -XTypeInType -dcore-lint λ> class NUM (a :: TYPE rep) where add :: a -> a -> a λ> :t add add :: NUM a => a -> a -> a }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12987#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler