Boxy-type ASSERT failure in 6.10: panic in xmonad-contrib

Testing xmonad-contrib-0.8 with ghc 6.10 RC. Probably a release-blocking bug.

[ 35 of 138] Compiling XMonad.Layout.MultiToggle ( XMonad/Layout/MultiToggle.hs, dist/build/XMonad/Layout/MultiToggle.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 6.10.0.20081007 for x86_64-unknown-linux):
	ASSERT failed! file typecheck/TcUnify.lhs line 1000
a{tv aKF8} [box]

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

To reproduced, grab cabal-install 0.6 and:

cabal install xmonad-contrib-0.8

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Linux
Architecture	x86_64 (amd64)