#13585: ala from Control.Lens.Wrapped panics -------------------------------------+------------------------------------- Reporter: fumieval | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: checker) | Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by pacak): ghc 8.0.1: successfull compilation ghc 8.2rc: {{{ ghc: panic! (the 'impossible' happened) (GHC version 8.2.0.20170404 for x86_64-unknown-linux): splitTyConApp (Exchange (Unwrapped (First ())) (Unwrapped (First ())) |> <* -> * -> *>_N) (Maybe ()) ((Identity |> <* -> *>_N) (Maybe ())) Call stack: CallStack (from HasCallStack): prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1134:58 in ghc:Outputable callStackDoc, called at compiler/utils/Outputable.hs:1138:37 in ghc:Outputable pprPanic, called at compiler/types/Type.hs:1105:34 in ghc:Type Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13585#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler