2013-02-09 135 views
1

我试图安装最新版本的海斯特,但是errors-1.3.1这是一个依赖项无法安装。有关如何克服这个问题的任何建议?cabal安装错误-1.3.1失败

$ cabal install errors-1.3.1 
Resolving dependencies... 
Configuring errors-1.3.1... 
Building errors-1.3.1... 
Preprocessing library errors-1.3.1... 
[1 of 5] Compiling Data.EitherR  (Data/EitherR.hs, dist/build/Data/EitherR.o) 
[2 of 5] Compiling Control.Error.Util (Control/Error/Util.hs, dist/build/Control/Error/Util.o) 

Control/Error/Util.hs:74:10: 
    Could not deduce (Monad m) arising from a use of `fmap' 
    from the context (Functor m) 
     bound by the type signature for 
       fmapRT :: Functor m => (a -> b) -> EitherT l m a -> EitherT l m b 
     at Control/Error/Util.hs:74:1-13 
    Possible fix: 
     add (Monad m) to the context of 
     the type signature for 
      fmapRT :: Functor m => (a -> b) -> EitherT l m a -> EitherT l m b 
    In the expression: fmap 
    In an equation for `fmapRT': fmapRT = fmap 
cabal: Error: some packages failed to install: 
errors-1.3.1 failed during the building phase. The exception was: 
ExitFailure 1 
+1

版本1.3.1是旧的,也许你应该'cabal update'并尝试安装1.4.1。如果这是一个由cabal选择的dep,那么使用--constraint'errors == 1.4.1' – 2013-02-09 23:51:59

+0

为什么最新的Heist(0.11.0)依赖于错误-1.3。*? – dan 2013-02-10 00:23:57

+1

Heist的git回购实际上纠正了这个问题。感谢您的帮助。 – dan 2013-02-10 00:25:22

回答

2

我在最新的错误,这是1.4.1(1.4.0有错误,我不导出EitherT和MaybeT型)解决了这个问题。我在这次添加了依赖关系的上限,以防止它在将来发生。

+0

非常感谢! – dan 2013-02-10 00:41:15

+0

不客气! – 2013-02-10 01:03:59