#11370: Redundant superclass warnings being included in -Wall destroys the "3 Release Policy" -------------------------------------+------------------------------------- Reporter: ekmett | Owner: bgamari Type: bug | Status: new Priority: highest | Milestone: 8.0.1 Component: Compiler (Type | Version: 7.10.3 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #11369, #11429 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by ekmett): Including `-fwarn-redundant-constraints` but not `-Wcompat` in `-Wall` to avoid contradictory suggestions, does indeed seem like a reasonable compromise. Going through all of the code I've updated for GHC 8, `-fwarn-redundant- constraints` actually gave useful information in 18/20 cases, and had to be manually disabled because there was no appropriate "fix" in 2 places, putting it on similar footing with `-fwarn-orphans`, where most times you can slide the instance around to live with the data type or class in question, but sometimes you get boxed in. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11370#comment:33 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler