#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): OK. This is the STG I get: {{{ Main.main_f [InlPrag=NOINLINE] :: Main.T [GblId, Caf=NoCafRefs, Unf=OtherCon []] = CCS_DONT_CARE Main.T2! []; Main.main_a [InlPrag=NOINLINE] :: Main.T [GblId, Unf=OtherCon []] = [] \u [] Main.main_f; Main.main1 :: GHC.Base.String [GblId] = [] \u [] case dataToTag# [Main.main_a] of a'_s3tm { __DEFAULT -> case <# [a'_s3tm 1#] of { __DEFAULT -> case a'_s3tm of { __DEFAULT -> GHC.Show.$fShowOrdering1; 1# -> GHC.Show.$fShowOrdering3; }; 1# -> GHC.Show.$fShowOrdering5; }; }; }}} Exactly the same problem, no evals around the CAF (`main_a`). Are you maybe confused because in the STG dump you also see the STG for `cmpT`? It's actually inlined in `main` so the top-level for `cmpT` is not used. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15696#comment:35 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler