#10999: ghc: panic! (the 'impossible' happened) -------------------------------------+------------------------------------- Reporter: res | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: #10045 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by thomie): * related: => #10045 Comment: Here is a smaller test to trigger the same bug: {{{ module T10999 where import qualified Data.Set as Set f :: () -> _ f _ = Set.fromList undefined g = map fst $ Set.toList $ f () }}} It is already fixed in HEAD, and seems like a duplicate of #10045. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10999#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler