#15696: Derived Ord instance for enumerations with more than 8 elements seems to be incorrect -------------------------------------+------------------------------------- Reporter: mrkkrp | Owner: (none) Type: bug | Status: new 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: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): The fact that using `dataToTag#` directly produces incorrect results is perhaps not terribly surprising, giving that it [http://git.haskell.org/ghc.git/blob/21efbc7599e39ec93b8b13b7d7b84811226e6f6f... must always be applied to an evalauted argument] (see `Note [dataToTag#]`). The fact that the version using `getTag` breaks is more worrisome, since `getTag` actually forces its argument (with a bang pattern). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15696#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler