seldom panic
To reproduce this bug, install GHC 6.8.20070916 and Gtk2Hs 0.9.12 as currently described on http://haskell.org/haskellwiki/Grapefruit#Building. There is a modified version of the current development version of Grapefruit attached to this bug report which is needed for bug reproduction. Sorry, but I wasn’t able to give you a small code example showing this bug in action since every time I started to reduce the code significantly, the bug vanished.
Unpack the attached file bug.tar.bz2, enter the directory named bug and run runghc Setup.lhs configure followed by runghc Setup.lhs build. Compilation should be successful. Then remove the second line of the file Haskell/Graphics/UI/Grapefruit/Adapters/Gtk2Hs/Window.hs and run runghc Setup.lhs build again. Now you should see the following error messages:
ghc-6.8.0.20070916: panic! (the 'impossible' happened)
(GHC version 6.8.0.20070916 for i386-unknown-linux):
tcIfaceGlobal (local): not found:
grapefruit-0.0:Graphics.UI.Grapefruit.Base.:CoF:R8Value{tc r76}
[(r6H,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.:R8Value{tc r6H}'),
(r6I,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.:R11Rep{tc r6I}'),
(r6J,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f9{v r6J}'),
(r6K,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f7{v r6K}'),
(r6L,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f6{v r6L}'),
(r6M,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f5{v r6M}'),
(r6N,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f4{v r6N}'),
(r6O,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f3{v r6O}'),
(r6P,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f10{v r6P}'),
(r6Q,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.FromSecond{v r6Q}'),
(r6R,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.FromFirst{v r6R}'),
(r6S,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.FromBoth{v r6S}'),
(r6T,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.FromSecond{d r6T}'),
(r6U,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.FromFirst{d r6U}'),
(r6V,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.poly_fail{v r6V}'),
(r6W,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$w=={v r6W}'),
(r6X,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a63{v r6X}'),
(r6Y,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a121{v r6Y}'),
(r6Z,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a57{v r6Z}'),
(r70,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a62{v r70}'),
(r71,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a321{v r71}'),
(r72,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a221{v r72}'),
(r73,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a38{v r73}'),
(r74,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.poly_for_{v r74}'),
(r77,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a59{v r77}'),
(r7c,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.lvl3{v r7c}'),
(r7g,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.Source{v r7g}'),
(r7i,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a52{v r7i}'),
(r7m,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a40{v r7m}'),
(r7n,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.poly_go{v r7n}'),
(r7o,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a20{v r7o}'),
(r7p,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a22{v r7p}'),
(r7q,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a56{v r7q}'),
(r7r,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a111{v r7r}'),
(r7s,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a19{v r7s}'),
(r7u,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a55{v r7u}'),
(r7w,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a311{v r7w}'),
(r7x,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a211{v r7x}'),
(r7y,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a18{v r7y}'),
(r7z,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$wa4{v r7z}'),
(r7A,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a27{v r7A}'),
(r7B,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a47{v r7B}'),
(r7D,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.lvl1{v r7D}'),
(r7E,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a44{v r7E}'),
(r7F,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a43{v r7F}'),
(r7G,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a41{v r7G}'),
(r7H,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a42{v r7H}'),
(r7I,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a39{v r7I}'),
(r7J,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a28{v r7J}'),
(r7K,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a35{v r7K}'),
(r7L,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a29{v r7L}'),
(r7M,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.:CoGeneralEventStream{tc r7M}'),
(r7P,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a26{v r7P}'),
(r7Q,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a25{v r7Q}'),
(r7R,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a23{v r7R}'),
(r7S,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a21{v r7S}'),
(r7T,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a17{v r7T}'),
(r7U,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a15{v r7U}'),
(r7V,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a16{v r7V}'),
(r7W,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.lvl{v r7W}'),
(r7Y,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a13{v r7Y}'),
(r80,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a11{v r80}'),
(r81,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a12{v r81}'),
(r82,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$wa3{v r82}'),
(r83,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$wa2{v r83}'),
(r84,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$wa1{v r84}'),
(r85,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a5{v r85}'),
(r88,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.Source{d r88}'),
(r89,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$wa{v r89}'),
(r8g,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a{v r8g}'),
(r8h,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.QuitReq{v r8h}'),
(r8i,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.QuitReqRep{tc r8i}'),
(r8j,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a60{v r8j}'),
(r8k,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.QuitReq{tc r8k}'),
(r8m,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$dMonoid1{v r8m}'),
(r8n,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a3{v r8n}'),
(r8o,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$dArrow1{v r8o}'),
(r8p,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a14{v r8p}'),
(r8t,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$dArrow{v r8t}'),
(r8v,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base./={v r8v}'),
(r8w,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.=={v r8w}'),
(r8x,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.min{v r8x}'),
(r8y,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.max{v r8y}'),
(r8z,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.<={v r8z}'),
(r8A,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.>{v r8A}'),
(r8B,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.>={v r8B}'),
(r8C,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.<{v r8C}'),
(r8D,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.compare{v r8D}'),
(r8E,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f2{v r8E}'),
(r8H,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCChange{tc r8H}'),
(r8I,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCAdditionInfo{tc r8I}'),
(r8J,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.CompCircuitIO{tc r8J}'),
(r8L,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a32{v r8L}'),
(r8M,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a30{v r8M}'),
(r8N,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a24{v r8N}'),
(r8O,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.SetupIO{tc r8O}'),
(r8P,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a45{v r8P}'),
(r8Q,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.:CoCompCircuit{tc r8Q}'),
(r8S,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a1{v r8S}'),
(r8T,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a9{v r8T}'),
(r8U,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCInput{tc r8U}'),
(r8V,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCStateAccessors{tc r8V}'),
(r8W,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a48{v r8W}'),
(r8X,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.CompCircuit{tc r8X}'),
(r8Y,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a49{v r8Y}'),
(r8Z,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a46{v r8Z}'),
(r90,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a50{v r90}'),
(r91,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.:CoCompInit{tc r91}'),
(r92,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a4{v r92}'),
(r93,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a2{v r93}'),
(r94,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.:CoComp{tc r94}'),
(r95,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a34{v r95}'),
(r96,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.Comp{tc r96}'),
(r97,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.CompInit{tc r97}'),
(r98,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a10{v r98}'),
(r99,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a7{v r99}'),
(r9a,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a54{v r9a}'),
(r9b,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.GeneralEventStream{tc r9b}'),
(r9c,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a8{v r9c}'),
(r9d,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a33{v r9d}'),
(r9e,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a37{v r9e}'),
(r9f,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.:CoPlainCircuit{tc r9f}'),
(r9j,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a36{v r9j}'),
(r9k,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.PlainCircuit{tc r9k}'),
(r9l,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.:CoEventStream{tc r9l}'),
(r9m,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a53{v r9m}'),
(r9n,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.EventStream{tc r9n}'),
(r9o,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a58{v r9o}'),
(r9p,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.OutputConnection{tc r9p}'),
(r9q,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.EventHandler{tc r9q}'),
(r9r,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a6{v r9r}'),
(r9s,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.InputConnection{tc r9s}'),
(r9t,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a61{v r9t}'),
(r9u,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.lvl6{v r9u}'),
(r9v,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.lvl5{v r9v}'),
(r9x,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.lvl4{v r9x}'),
(r9y,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.$f1{v r9y}'),
(r9A,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DSignal{d r9A}'),
(r9B,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.MergeValue{tc r9B}'),
(r9D,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.Source{tc r9D}'),
(r9F,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.a51{v r9F}'),
(r9G,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DSignal{v r9G}'),
(r9H,
Type constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DSignal{tc r9H}'),
(r9I,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.emptyDSignal{v r9I}'),
(r9J,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.mergeDSignals{v r9J}'),
(r9K,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.statefulDSignal{v r9K}'),
(r9L,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.dSignalIC{v r9L}'),
(r9M,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.dSignalOC{v r9M}'),
(r9N,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.statefulEventStream{v r9N}'),
(r9O,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.eventStreamMerger{v r9O}'),
(r9P,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.eventStreamMemo{v r9P}'),
(r9Q,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.eventStreamSource{v r9Q}'),
(r9R,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.onEvent{v r9R}'),
(r9S,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.eventStreamOC{v r9S}'),
(r9T,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.newGeneralEventStream{v r9T}'),
(r9U,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.fromGeneralEventStream{v r9U}'),
(r9V,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.raiseEvent{v r9V}'),
(r9W,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.comp{v r9W}'),
(r9X,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.transformNativeComp{v r9X}'),
(r9Y,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.withInputPort{v r9Y}'),
(r9Z,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.withOutputPort{v r9Z}'),
(ra0,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.emptyCompInit{v ra0}'),
(ra1,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.useComp{v ra1}'),
(ra2,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.useCompCircuit{v ra2}'),
(ra3,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.dccInputConnection{v ra3}'),
(ra4,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.fromComp{v ra4}'),
(ra5,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.fromPlainCircuit{v ra5}'),
(ra6,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.>>|{v ra6}'),
(ra7,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.|>>{v ra7}'),
(ra8,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.compLoop{v ra8}'),
(ra9,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.CompCircuit{d ra9}'),
(raa,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.CompCircuit{v raa}'),
(rab,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCAdditionInfo{d rab}'),
(rac,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCAdditionInfo{v rac}'),
(rad,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCAddition{d rad}'),
(rae,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCAddition{v rae}'),
(raf,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCRemoval{d raf}'),
(rag,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCRemoval{v rag}'),
(rah,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCMove{d rah}'),
(rai,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCMove{v rai}'),
(raj,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCInput{d raj}'),
(rak,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCInput{v rak}'),
(ral,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.handleAddition{v ral}'),
(ram,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.handleRemoval{v ram}'),
(ran,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.handleMove{v ran}'),
(rao,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.getCompDataList{v rao}'),
(rap,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCStateAccessors{d rap}'),
(raq,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.DCCStateAccessors{v raq}'),
(rar,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.CompInit{d rar}'),
(ras,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.CompInit{v ras}'),
(rat,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.Comp{d rat}'),
(rau,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.Comp{v rau}'),
(rav,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.PlainCircuit{d rav}'),
(raw,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.PlainCircuit{v raw}'),
(rax,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.GeneralEventStream{d rax}'),
(ray,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.GeneralEventStream{v ray}'),
(raz,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.EventStream{d raz}'),
(raA,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.EventStream{v raA}'),
(raB,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.FromBoth{d raB}'),
(raC,
Identifier `grapefruit-0.0:Graphics.UI.Grapefruit.Base.runCompCircuit{v raC}'),
(raD,
Data constructor `grapefruit-0.0:Graphics.UI.Grapefruit.Base.QuitReq{d raD}')]
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabugIf you skip the first runghc Setup.hs build (i.e., the building of the unmodified version), the bug doesn’t appear.
Edited by Ian Lynagh -