'impossible' compile time error, when using `runStream'.
ghc: panic! (the 'impossible' happened)
(GHC version 7.0.3 for i386-unknown-linux):
addTickHsExpr
(|/\(@ a{tv aZE} [sk]).
(arrows-0.4.4.0:Control.Arrow.Transformer.Stream.runStream{v rfV} [gid])
@ t{tv aZY} [sk]
@ a{tv aZE} [sk]
@ t{tv a102} [sk]
@ t{tv aZZ} [sk]
$dArrowLoop{v aZF} [lid]
((\ ((x{v aZc} [lid] :: t{tv a102} [sk]))
-> {49:30-52}
((base:Control.Arrow.loop{v 020} [gid[ClassOp]])
@ (arrows-0.4.4.0:Control.Arrow.Transformer.Stream.StreamArrow{tc rgp}
t{tv aZY} [sk])
$dArrowLoop{v aZG} [lid])
@ (t{tv a101} [sk], t{tv a102} [sk])
@ d{tv a100} [sk]
@ t{tv aZZ} [sk]
(((base:Control.Arrow.arr{v 01V} [gid[ClassOp]])
@ (arrows-0.4.4.0:Control.Arrow.Transformer.Stream.StreamArrow{tc rgp}
t{tv aZY} [sk])
$dArrow{v aZI} [lid])
@ ((t{tv a101} [sk], t{tv a102} [sk]), d{tv a100} [sk])
@ (t{tv aZZ} [sk], d{tv a100} [sk])
k{v aZ9} [lid]) -< (s0{v aZa} [lid], x{v aZc} [lid])))|)
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Edited by Simon Peyton Jones