#15290: QuantifiedConstraints: panic "addTcEvBind NoEvBindsVar" -------------------------------------+------------------------------------- Reporter: goldfire | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: | QuantifiedConstraints Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: 9123, 14883 Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
Wait, you're saying that deriving classes with methods that use higher- rank types will no longer work?
No, I am not saying that (see the second bullet). It's just that if you can't ''simultaneously'' exploit impredicative instantiation of `coerce` and quantified constraints. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15290#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler