#12593: ghci spins forever -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * cc: goldfire (added) Comment: Yes, I can reproduce this with HEAD. It seems that we are updating a unification variable so that it points to itself. I see {{{ Following filled tyvar k_arL[tau:1] = (k_apN[sk] |> Sym U(hole:{arZ}, *, (((k_arR[tau:1] -> k_arU[tau:1] -> TYPE t_arG[tau:1]) -> Constraint) -> (k_arL[tau:1] -> k_arO[tau:1] -> TYPE t_arJ[tau:1]) -> *) -> Constraint)_N) }}} And that is disaster. Remarkable example! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12593#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler