#10635: -fwarn-redundant-constraints should not be part of -Wall -------------------------------------+------------------------------------- Reporter: Lemming | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 7.11 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: #9939, #9973, | Differential Rev(s): #10100, #10183 | Wiki Page: | -------------------------------------+------------------------------------- Comment (by Lemming): Replying to [comment:6 bgamari]:
GHC-8.0 does not warn about any of these two. Should it?
Indeed GHC 8.0 warns that the `a ~ b` constraint is redundant. This is arguably wrong and I've opened #11582 for this case. This is almost certainly not the last example of this sort that we will find.
I just re-checked: ghci-8.0.0.20160214 warns with -fwarn-redundant- constraints but not with -Wall. That is, -fwarn-redundant-constraints is no longer part of -Wall? But this is the subject of this ticket. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10635#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler