What would this look like? Any class in the cycle being marked with the
#11369: Suppress redundant-constraint warnings in case of empty classes -------------------------------------+------------------------------------- Reporter: hvr | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #11370 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): pragma would allow undecidable superclasses? This issue is when we report a class cycle. If any class in the cycle has a "UndecidableSuperClasses" pragma, then yes, I suggest we do not warn. It'd be great to put this per-class stuff in 8.0, but someone would have to step up and implement it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11369#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler