#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 osa1): Looking at STG before and after CSE, the only difference is: {{{ case val_scuG of { (#_|#) err_scuJ [Occ=Once] -> case (#_|#) [err_scuJ] of sat_scuK [Occ=Once] { __DEFAULT -> Main.$w$j ipv_scuC leftovers1_scuF sat_scuK; }; ... }}} becomes: {{{ case val_scuG of { (#_|#) err_scuJ [Occ=Once] -> case wild2_scuI of sat_scuK [Occ=Once] { __DEFAULT -> Main.$w$j ipv_scuC leftovers1_scuF sat_scuK; }; ... }}} But note that wild2_scuI was dead before (dead binders are not printed by the STG printer so I'm not sure where it's bound). If the problem is reviving wild2_scuI then this is a duplicate of #14895. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15300#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler