haskell - Haskell Fay安装失败

我正在尝试安装fay，但src编译失败并显示

$ cabal install fay
...
Preprocessing executable 'fay' for fay-0.10.1.0...
[ 1 of 14] Compiling Data.List.Extra  ( src/Data/List/Extra.hs, dist/build/fay/fay- tmp/Data/List/Extra.o )
[ 2 of 14] Compiling System.Process.Extra ( src/System/Process/Extra.hs, dist/build/fay/fay-tmp/System/Process/Extra.o )
...
[13 of 14] Compiling Language.Fay     ( src/Language/Fay.hs, dist/build/fay/fay-tmp/Language/Fay.o )
[14 of 14] Compiling Main             ( src/Main.hs, dist/build/fay/fay-tmp/Main.o )

src/Main.hs:89:55:
Couldn't match expected type `Either ParseError (Maybe String)'
            with actual type `Maybe b0'
Expected type: b0 -> Either ParseError (Maybe String)
  Actual type: b0 -> Maybe b0
In the first argument of `(.)', namely `Just'
In the first argument of `reader', namely `(Just . Just)'

src/Main.hs:96:35:
Couldn't match expected type `Either ParseError a0'
            with actual type `Maybe b0'
Expected type: b0 -> Either ParseError a0
  Actual type: b0 -> Maybe b0
In the first argument of `(.)', namely `Just'
In the first argument of `reader', namely
  `(Just . wordsBy (== ','))'
Failed to install fay-0.10.1.0
cabal: Error: some packages failed to install:
fay-0.10.1.0 failed during the building phase. The exception was:
ExitFailure 1

我不知道这是我的错误还是包装问题。

我正在使用:Arch Linux，ghc-7.4.2，cabal-1.16.0.3

最佳答案

这绝对是一个软件包问题，因为没有足够严格地指定依赖项。如果软件包遵循Package Versioning Policy，则如果您可以满足依赖关系，则应构建该软件包。

在查看fay软件包的说明时，我注意到几乎没有任何依赖项具有下限或上限。因此，基本上，您必须进行实验。

查看代码，我发现错误中提到的reader是Options.Applicative.Builder.reader。此函数已将类型签名更改为0.4.3至0.5.0，因此请尝试通过将--constraint "optparse-applicative < 0.5"传递给cabal install来降级optparse-applicative。

关于haskell - Haskell Fay安装失败，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14010302/