#15696: Derived Ord instance for enumerations with more than 8 elements seems to be incorrect -------------------------------------+------------------------------------- Reporter: mrkkrp | Owner: (none) 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: | Differential Rev(s): Phab:D5196 Wiki Page: | -------------------------------------+------------------------------------- Comment (by osa1): I'm confused
That's what you get for monoidal's code in comment:18
I didn't even look at comment:18. I tried your code in comment:13 and what happens there is exactly what I explained in my patch.
The evals are there, as comment:14 shows.
comment:14 shows that evals are there if I don't inline `cmpT`, and that makes sense as I explained in comment:31. We can't assume that args are evaluated so we eval them.
And yet we get the wrong answer.
I get the right answer when I get the STG in comment:14. Could you try to reproduce the error in comment:14 and give me more detailed instructions (showing the source and invoked GHC commands)? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15696#comment:33 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler