id summary reporter owner description type status priority milestone component version resolution keywords cc os architecture failure difficulty testcase blockedby blocking related 2162 panic! (the 'impossible' happened) while compiling XMonadContrib ivant "I was rebuilding XMonadContrib without doing Cabal clean first. I got the ""panic!"" message. The problem was persistent: if I started Cabal build again, I was getting the same message. After I did Cabal clean followed by Cabal build, the problem disappeared. Seem to be a problem with interacting with previously compiled code. Here is the output of GHC: {{{ [108 of 117] Compiling XMonad.Config.Sjanssen ( XMonad/Config/Sjanssen.hs, dist/build/XMonad/Config/Sjanssen.o ) ghc-6.8.2: panic! (the 'impossible' happened) (GHC version 6.8.2 for i386-unknown-linux): bind_args xmonad-0.6:XMonad.Core.:DLayoutClass{d r19g} [tpl_B2{v} [lid], tpl_B3{v} [lid], tpl_B4{v} [lid], tpl_B5{v} [lid], tpl_B6{v} [lid], tpl_B7{v} [lid], tpl_B8{v} [lid], tpl_B9{v} [lid]] [TYPE xmonad-contrib-0.6:XMonad.Layout.HintedTile.HintedTile{tc r19zx}, TYPE X11-1.4.1:Graphics.X11.Types.Window{tc r5}, xmonad-contrib-0.6:XMonad.Layout.HintedTile.$f4{v r19zw} [gid] @ base:GHC.Word.Word32{tc 333}, xmonad-contrib-0.6:XMonad.Layout.HintedTile.doLayout{v r19zv} [gid], xmonad-contrib-0.6:XMonad.Layout.HintedTile.$dmpureLayout{v r19zu} [gid], xmonad-contrib-0.6:XMonad.Layout.HintedTile.a1{v r19zt} [gid] `cast` (base:GHC.Prim.right{(w) tc 34E} (base:GHC.Prim.inst{(w) tc 34H} (base:GHC.Prim.inst{(w) tc 34H} (base:GHC.Prim.trans{(w) tc 34y} (forall (layout{tv i28Jn} [tv] :: base:GHC.Prim.*{(w) tc 34d} -> base:GHC.Prim.*{(w) tc 34d}) a{tv i28Jo} [tv]. (xmonad-0.6:XMonad.Core.LayoutClass{tc rzi} layout{tv i28Jn} [tv] a{tv i28Jo} [tv]) => layout{tv i28Jn} [tv] a{tv i28Jo} [tv] -> X11-1.4.1:Graphics.X11.Xlib.Types.Rectangle{tc ruD} -> xmonad-0.6:XMonad.Core.XConf{tc rz} -> xmonad-0.6:XMonad.Core.XState{tc ry} -> base:GHC.Prim.sym{(w) tc 34v} ((base:GHC.IOBase.:CoIO{tc rx}) (([(a{tv i28Jo} [tv], X11-1.4.1:Graphics.X11.Xlib.Types.Rectangle{tc ruD})], base:Data.Maybe.Maybe{tc rB} (layout{tv i28Jn} [tv] a{tv i28Jo} [tv])), xmonad-0.6:XMonad.Core.XState{tc ry}))) (forall (layout{tv i28Jp} [tv] :: base:GHC.Prim.*{(w) tc 34d} -> base:GHC.Prim.*{(w) tc 34d}) a{tv i28Jq} [tv]. (xmonad-0.6:XMonad.Core.LayoutClass{tc rzi} layout{tv i28Jp} [tv] a{tv i28Jq} [tv]) => layout{tv i28Jp} [tv] a{tv i28Jq} [tv] -> X11-1.4.1:Graphics.X11.Xlib.Types.Rectangle{tc ruD} -> base:GHC.Prim.right{(w) tc 34E} (base:GHC.Prim.inst{(w) tc 34H} (base:GHC.Prim.trans{(w) tc 34y} (forall a1{tv i28Jr} [tv]. a1{tv i28Jr} [tv] -> base:GHC.Prim.trans{(w) tc 34y} (xmonad-0.6:XMonad.Core.XConf{tc rz} -> base:GHC.Prim.sym{(w) tc 34v} ((mtl-1.1.0.0:Control.Monad.State.Lazy.:CoStateT{tc ru}) xmonad-0.6:XMonad.Core.XState{tc ry} base:GHC.IOBase.IO{tc 32I} a1{tv i28Jr} [tv])) (base:GHC.Prim.sym{(w) tc 34v} ((mtl-1.1.0.0:Control.Monad.Reader.:CoReaderT{tc rt}) xmonad-0.6:XMonad.Core.XConf{tc rz} (mtl-1.1.0.0:Control.Monad.State.Lazy.StateT{tc rv} xmonad-0.6:XMonad.Core.XState{tc ry} base:GHC.IOBase.IO{tc 32I}) a1{tv i28Jr} [tv]))) (forall a1{tv i28Js} [tv]. a1{tv i28Js} [tv] -> base:GHC.Prim.sym{(w) tc 34v} (xmonad-0.6:XMonad.Core.:CoX{tc rs}) a1{tv i28Js} [tv])) ([(a{tv i28Jq} [tv], X11-1.4.1:Graphics.X11.Xlib.Types.Rectangle{tc ruD})], base:Data.Maybe.Maybe{tc rB} (layout{tv i28Jp} [tv] a{tv i28Jq} [tv]))))) xmonad-contrib-0.6:XMonad.Layout.HintedTile.HintedTile{tc r19zx}) X11-1.4.1:Graphics.X11.Types.Window{tc r5}) :: xmonad-contrib-0.6:XMonad.Layout.HintedTile.HintedTile{tc r19zx} X11-1.4.1:Graphics.X11.Types.Window{tc r5} -> X11-1.4.1:Graphics.X11.Xlib.Types.Rectangle{tc ruD} -> xmonad-0.6:XMonad.Core.XConf{tc rz} -> xmonad-0.6:XMonad.Core.XState{tc ry} -> base:GHC.Prim.State#{(w) tc 32q} base:GHC.Prim.RealWorld{(w) tc 31E} -> (# base:GHC.Prim.State#{(w) tc 32q} base:GHC.Prim.RealWorld{(w) tc 31E}, (([(X11-1.4.1:Graphics.X11.Types.Window{tc r5}, X11-1.4.1:Graphics.X11.Xlib.Types.Rectangle{tc ruD})], base:Data.Maybe.Maybe{tc rB} (xmonad-contrib-0.6:XMonad.Layout.HintedTile.HintedTile{tc r19zx} X11-1.4.1:Graphics.X11.Types.Window{tc r5})), xmonad-0.6:XMonad.Core.XState{tc ry}) #) ~ xmonad-contrib-0.6:XMonad.Layout.HintedTile.HintedTile{tc r19zx} X11-1.4.1:Graphics.X11.Types.Window{tc r5} -> X11-1.4.1:Graphics.X11.Xlib.Types.Rectangle{tc ruD} -> xmonad-0.6:XMonad.Core.X{tc rD} ([(X11-1.4.1:Graphics.X11.Types.Window{tc r5}, X11-1.4.1:Graphics.X11.Xlib.Types.Rectangle{tc ruD})], base:Data.Maybe.Maybe{tc rB} (xmonad-contrib-0.6:XMonad.Layout.HintedTile.HintedTile{tc r19zx} X11-1.4.1:Graphics.X11.Types.Window{tc r5}))), xmonad-contrib-0.6:XMonad.Layout.HintedTile.$dmhandleMessage{v r19zs} [gid], xmonad-contrib-0.6:XMonad.Layout.HintedTile.pureMessage{v r19zr} [gid], xmonad-contrib-0.6:XMonad.Layout.HintedTile.description{v r19zq} [gid]] scrut: xmonad-contrib-0.6:XMonad.Layout.HintedTile.$f1{v r19yR} [gid] Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} Sjanssen.hs is {{{ {-# OPTIONS_GHC -fno-warn-missing-signatures #-} module XMonad.Config.Sjanssen (sjanssenConfig) where import XMonad hiding (Tall(..)) import qualified XMonad.StackSet as W import XMonad.Actions.CopyWindow import XMonad.Layout.Tabbed import XMonad.Layout.HintedTile import XMonad.Config (defaultConfig) import XMonad.Layout.NoBorders import XMonad.Hooks.DynamicLog import XMonad.Hooks.ManageDocks import XMonad.Prompt import XMonad.Prompt.Shell import XMonad.Util.Run (spawnPipe) import XMonad.Layout.DwmStyle import qualified Data.Map as M import System.IO (hPutStrLn) sjanssenConfig = do xmobar <- spawnPipe ""xmobar"" return $ defaultConfig { terminal = ""urxvtc"" , workspaces = [""irc"", ""web""] ++ map show [3 .. 7 :: Int] ++ [""mail"", ""im""] , logHook = dynamicLogWithPP $ sjanssenPP { ppOutput = hPutStrLn xmobar } , modMask = mod4Mask , mouseBindings = \(XConfig {modMask = modm}) -> M.fromList $ [ ((modm, button1), (\w -> focus w >> mouseMoveWindow w)) , ((modm, button2), (\w -> focus w >> windows W.swapMaster)) , ((modm.|. shiftMask, button1), (\w -> focus w >> mouseResizeWindow w)) ] , keys = \c -> mykeys c `M.union` keys defaultConfig c , layoutHook = dwmStyle shrinkText myTheme $ avoidStruts $ smartBorders (tiled Tall ||| tiled Wide ||| Full ||| tabbed shrinkText myTheme) , manageHook = manageHook defaultConfig <+> manageDocks } where tiled = HintedTile 1 0.03 0.5 mykeys (XConfig {modMask = modm, workspaces = ws}) = M.fromList $ [((modm, xK_p ), shellPrompt myPromptConfig) ,((modm .|. shiftMask, xK_c ), kill1) ,((modm .|. shiftMask .|. controlMask, xK_c ), kill) ,((modm .|. shiftMask, xK_0 ), windows $ \w -> foldr copy w ws) ,((modm, xK_b ), sendMessage ToggleStruts) ] myFont = ""xft:Bitstream Vera Sans Mono:pixelsize=10"" myTheme = defaultTheme { fontName = myFont } myPromptConfig = defaultXPConfig { position = Top , font = myFont , promptBorderWidth = 0 } }}}" bug closed normal Compiler 6.8.2 duplicate Unknown/Multiple x86