#13601: GHC errors but hangs -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: TypeInType, | LevityPolymorphism 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 simonpj): I know roughly what is happening here. * When checking kinds we call `solveEqualities` which immediately reports type errors * The offending kind-equality constraint in this case has a `TypeEqOrigin` whose `uo_thing` is built by `checkExpectedKind`. * That `uo_thing` is printed as part of the error message. Alas it contains a type (not a kind); and that type involves some knot-tied `TyCons`. Result: black hole. The exact details are still hazy to me. The entire `uo_thing` stuff seems pretty grim. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13601#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler