#12966: GHC panics with forall and constraint -------------------------------------+------------------------------------- Reporter: xcmw | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{ λ> type Maybeify c = forall d. (c d) => ((~) (Maybe d)) <interactive>:2:39: error:ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-apple-darwin): print_equality ~ Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12966 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler