#15696: Derived Ord instance for enumerations with more than 8 elements seems to be incorrect -------------------------------------+------------------------------------- Reporter: mrkkrp | Owner: osa1 Type: bug | Status: patch Priority: highest | Milestone: 8.6.2 Component: Compiler | Version: 8.6.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: #14677, #15155 | Differential Rev(s): Phab:D5196, Wiki Page: | Phab:D5201, Phab:D5226 -------------------------------------+------------------------------------- Changes (by bgamari): * differential: Phab:D5196, Phab:D5201 => Phab:D5196, Phab:D5201, Phab:D5226 Comment: I gave Secondly from comment:77 a try while waiting for GHC 8.4.4 builds. The result is Phab:D5226. However, the approach presented does seem a bit odd since the demand resulting from demand analysis is still conservative; we merely make up for this conservatism in worker-wrapper. However, this doesn't help other (hypothetical) consumers of demand analysis. Perhaps it would be good to open a ticket to ensure we don't forget about this limitation. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15696#comment:80 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler