無法安裝 xmonad-extras？

Question

hackage中的軟件沒有經過徹底的測試嗎？ cabal install xmonad-eval甚至會導致以下錯誤：

$cabal install xmonad-extras
...    
[10 of 22] Compiling Hint.Reflection  ( src/Hint/Reflection.hs, dist/build/Hint/Reflection.o)
src/Hint/Reflection.hs:75:41:
Couldn't match expected type `[Char]' with actual type `a0 -> String'
Expected type: Id 
Actual type: a0 -> String
In the return type of a call of `getUnqualName'
In the first argument of `Class', namely `(getUnqualName c)'
Failed to install hint-0.3.3.5
cabal: Error: some packages failed to install:
hint-0.3.3.5 failed during the building phase. The exception was:
ExitFailure 1
xmonad-extras-0.10.1.2 depends on hint-0.3.3.5 which failed to install.

任何建議表示贊賞！

Answer 1

通過將 GHC 從 7.0.3 升級到 7.4.1，效果很好。