#15300: Unboxed Sums Crash -------------------------------------+------------------------------------- Reporter: andrewthad | Owner: osa1 Type: bug | Status: new Priority: highest | Milestone: 8.6.1 Component: Compiler | Version: 8.5 Resolution: | Keywords: UnboxedSums Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Good sleuthing! What about doing StgCse after unarising? Then the difference would be obvious! We do CSE in STG even though we've done it already in Core, because we can sometimes common-up things that have the same representation in STG even though they have different types in Core. So it's possible that as well as prevent bogus CSE in the case you describe, you might get extra CSE in some other case. But I'm not close enough to StgCSE to think of an example. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15300#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler