#10176: Invalid core generated with GHC 7.10 RC3 -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: high | Milestone: 7.10.1 Component: Compiler | Version: 7.10.1-rc3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by NeilMitchell): That's quite different since (after inlining a few bits): {{{ $wlvl $wlvl = \ _ -> error "here" m = $wlvl void# }}} So {{{m}}} evaluates to {{{_|_}}} in GHC 7.8 which means a case with no alternatives is correct. However, in 7.10 the scrutinee evaluates to a lambda, not {{{_|_}}}, so no alternatives is wrong. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10176#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler