gistfile1.txt

[1 of 1] Compiling Main             ( T8762.hs, T8762.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 7.8.20140130 for x86_64-apple-darwin):
	dsLet: unlifted
    AbsBinds [a{tv aB0} [tv]] []
      {Exports: [a{v aqn} [lid] <= a{v aAW} [lid]
                   /\(@ a{tv aB2} [tv]). (<>) @ ghc-prim:GHC.Prim.Any{(w) tc 31N},
                 b{v aqo} [lid] <= b{v aAX} [lid]
                   (<>) @ ghc-prim:GHC.Prim.Any{(w) tc 31N}]
       Exported types: a{v aqn} [lid]
                         :: forall a{tv aB0} [tv]. main:Main.Ty{tc rnS} a{tv aB0} [tv]
                       [LclId, Str=DmdType]
                       b{v aqo} [lid] :: ()
                       [LclId, Str=DmdType]
       Binds: {T8762.hs:10:7-32}
              {T8762.hs:10:7-16}
              (# {T8762.hs:10:10}
                 ((a{v aAW} [lid] :: main:Main.Ty{tc rnS} a{tv aB0} [tv])),
                 {T8762.hs:10:13}
                 ((b{v aAX} [lid] :: ())) #)
                = {T8762.hs:10:20-32}
                  (main:Main.bug{v rqa}) @ a{tv aB0} [tv]
                    ((base:GHC.Err.undefined{(w) v 02v})
                     @ (main:Main.Ty{tc rnS} a{tv aB0} [tv]))
       Evidence: EvBinds{}}
    base:GHC.Base.return{v 02O} [gid[ClassOp]]
      @ ghc-prim:GHC.Types.IO{tc 32I}
      $dMonad_aBd{v} [lid]
      @ ()
      ghc-prim:GHC.Tuple.(){(w) v 71} [gid[DataCon]]