#11172: Turning on optimisations produces Impossible case alternative -------------------------------------+------------------------------------- Reporter: nh2 | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton):
First thing I'd appreciate is somebody to tell me: Is this a real bug or something GHC allows itself to do? Since for most other run-time errors, GHC asks me to report a bug, but it doesn't do so for `Impossible case alternative`.
It is a GHC bug. Are you sure you have seen GHC ask you to report a bug when running a program compiled by GHC (other than GHC itself)? I don't think that ever happens. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11172#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler