Cabal不安装4.7.0.0版本的基础版

时间:2014-04-19 18:14:35

标签: haskell cabal

我需要新功能" isLeft" Data.E v.4.7.0.0,但cabal不安装新库。

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Alberto>cabal update
Downloading the latest package list from hackage.haskell.org
Note: there is a new version of cabal-install available.
To upgrade, run: cabal install cabal-install

C:\Users\Alberto>cabal install base
Resolving dependencies...
All the requested packages are already installed:
base-4.6.0.1
Use --reinstall if you want to reinstall anyway.

C:\Users\Alberto>date
The current date is: 19/04/2014

为什么会这样?

如何将基础软件包升级到4.7版本?

1 个答案:

答案 0 :(得分:7)

base是一个特殊的包。你不能升级它。如果你想要base-4.7,你将不得不使用GHC 7.8。