Yesod安装失败（即文本包）
我尝试通过 cabal 安装 Yesod，但安装 Data.Text 时总是失败。
我尝试用cabal install text单独安装text，结果出现错误信息：
Resolving dependencies...
Configuring text-0.11.1.0...
Preprocessing library text-0.11.1.0...
Building text-0.11.1.0...
Data/Text/Lazy/Builder/RealFloat.hs:21:7:
Could not find module `Data.Text.Lazy.Builder.RealFloat.Functions':
Use -v to see a list of the files searched for.
cabal: Error: some packages failed to install:
text-0.11.1.0 failed during the building phase. The exception was:
ExitFailure 1
调查下载的text包的目录结构，发现确实没有Data/Text/Lazy /Builder/RealFloat/Functions.hs。最接近的是 Data/Text/Lazy/Builder/Functions.hs （但这不包含 RealFloat.hs 试图导入的函数，该函数是 >roundTo）。
我该如何解决这个问题？
I'm trying to install Yesod via cabal, but it keeps failing on installing Data.Text.
I tried installing text separately with cabal install text, resulting in an error message:
Resolving dependencies...
Configuring text-0.11.1.0...
Preprocessing library text-0.11.1.0...
Building text-0.11.1.0...
Data/Text/Lazy/Builder/RealFloat.hs:21:7:
Could not find module `Data.Text.Lazy.Builder.RealFloat.Functions':
Use -v to see a list of the files searched for.
cabal: Error: some packages failed to install:
text-0.11.1.0 failed during the building phase. The exception was:
ExitFailure 1
Investigating the directory structure of the text package that was downloaded, I find that there really is no Data/Text/Lazy/Builder/RealFloat/Functions.hs. The closest thing is Data/Text/Lazy/Builder/Functions.hs (but this doesn't contain the function RealFloat.hs was trying to import, which was roundTo).
How can I fix this?
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这是一个 ghc7.0 相关问题（并在“Build”下的 hackage 中列出失败”）。尝试安装适用于 yesod 的 text-0.11.0.8 。
This is a ghc7.0 related issue (and listed at hackage under "Build failure"). Try to install text-0.11.0.8 that should work for yesod.