[xmonad] Issue 565 in xmonad: xmonad-contrib--0.11.2 does not compile on GHC 7.8 rc2

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Status: New
Owner: ----

New issue 565 by StevensE... at gmail.com: xmonad-contrib--0.11.2 does not  
compile on GHC 7.8 rc2
http://code.google.com/p/xmonad/issues/detail?id=565

What steps will reproduce the problem?
1. Install GHC 7.8-rc2
2. cabal install --with-compiler=ghc-7.8.0.20140228 xmonad-contrib

What is the expected output? What do you see instead?

I expect to see a successful compile. Instead I see:

Downloading xmonad-contrib-0.11.2...
Configuring xmonad-contrib-0.11.2...
Building xmonad-contrib-0.11.2...
Preprocessing library xmonad-contrib-0.11.2...
[  1 of 226] Compiling XMonad.Util.StringProp ( XMonad/Util/StringProp.hs,  
dist/build/XMonad/Util/StringProp.o )
[  2 of 226] Compiling XMonad.Util.Replace ( XMonad/Util/Replace.hs,  
dist/build/XMonad/Util/Replace.o )
[  3 of 226] Compiling XMonad.Util.CustomKeys ( XMonad/Util/CustomKeys.hs,  
dist/build/XMonad/Util/CustomKeys.o )
[  4 of 226] Compiling XMonad.Layout.ThreeColumns (  
XMonad/Layout/ThreeColumns.hs, dist/build/XMonad/Layout/ThreeColumns.o )
[  5 of 226] Compiling XMonad.Layout.StackTile (  
XMonad/Layout/StackTile.hs, dist/build/XMonad/Layout/StackTile.o )
[  6 of 226] Compiling XMonad.Layout.Spiral ( XMonad/Layout/Spiral.hs,  
dist/build/XMonad/Layout/Spiral.o )
[  7 of 226] Compiling XMonad.Layout.Roledex ( XMonad/Layout/Roledex.hs,  
dist/build/XMonad/Layout/Roledex.o )
[  8 of 226] Compiling XMonad.Layout.ResizableTile (  
XMonad/Layout/ResizableTile.hs, dist/build/XMonad/Layout/ResizableTile.o )
[  9 of 226] Compiling XMonad.Layout.OneBig ( XMonad/Layout/OneBig.hs,  
dist/build/XMonad/Layout/OneBig.o )
[ 10 of 226] Compiling XMonad.Layout.MultiToggle (  
XMonad/Layout/MultiToggle.hs, dist/build/XMonad/Layout/MultiToggle.o )

XMonad/Layout/MultiToggle.hs:162:9:
     Could not deduce (HList b w0)
       arising from the ambiguity check for '??'
     from the context (HList b w)
       bound by the type signature for
                  (??) :: HList b w => a -> b -> HCons a b
       at XMonad/Layout/MultiToggle.hs:162:9-42
     The type variable 'w0' is ambiguous
     In the ambiguity check for:
       forall a b w. HList b w => a -> b -> HCons a b
     To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
     In the type signature for '??':
       (??) :: HList b w => a -> b -> HCons a b
cabal: Error: some packages failed to install:
xmonad-contrib-0.11.2 failed during the building phase. The exception was:
ExitFailure 1

What version of the product are you using? On what operating system?

xmonad-contrib-0.11.2

Please provide any additional information below.

There are two things that need to be done. Write down the incompatibility  
in the .cabal file for xmonad-contrib and fix this in a later version.

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