Cabal未能更新cabal-install

问题描述

每次我安装一个库时，cabal都会告诉我安装一个新版本的cabal-install。尽管我运行（显然成功）下面列出的过程，但cabal-install的版本保持不变。我哪里出错了？ （我的操作系统是Windows 7 64位）

我的用户PATH是C：\ Users \Alberto\AppData\Roaming\cabal\bin

系统变量：CABAL_DIR = C：\ Users \Alberto\AppData\Roaming\cabal

更新之前

  
 的输出是什么？C：\ Users \Alberto\AppData\Roaming\ cabal \\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\
Every time I install a library, cabal tells me to install a new version of cabal-install. Despite the fact that i run (with apparent success) the procedure that list below, the version of cabal-install remains unchanged. Where I am going wrong? (My OS is Window 7 64-bits)

My User PATH is C:\Users\Alberto\AppData\Roaming\cabal\bin

System variables: CABAL_DIR = C:\Users\Alberto\AppData\Roaming\cabal

BEFORE the update
C:\Users\Alberto>cabal -V
cabal-install version 1.16.0.2
using version 1.16.0 of the Cabal library

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 cabal-install
AFTER the update
Linking dist\build\cabal\cabal.exe ...
Installing executable(s) in C:\Users\Alberto\AppData\Roaming\cabal\bin
Installed cabal-install-1.18.0.2

C:\Users\Alberto>cabal -V
cabal-install version 1.16.0.2
using version 1.16.0 of the Cabal library
But: 
C:\Users\Alberto>C:\Users\Alberto\AppData\Roaming\cabal\bin\cabal.exe -V
cabal-install version 1.18.0.2
using version 1.18.1.2 of the Cabal library
I am very confused about.
 解决方案 
What's the output of C:\Users\Alberto\AppData\Roaming\cabal\bin\cabal.exe -V?
                        
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