Haskell http-conduit-1.9.6“没有用于（Read UTCTime）的实例”编译错误 [英] Haskell http-conduit-1.9.6 "No instance for (Read UTCTime)" compilation error

问题描述

我试图安装http-conduit-1.9.6（我的Haskell应用程序需要该版本），而我的cabal install http-conduit-1.9.6给了我以下错误：

构建http-conduit-1.9.6 ...

预处理库http-conduit-1.9.6 ...

[1 of 12 ]编译Network.HTTP.Conduit.Util（网络/ HTTP / Conduit / Util.hs，dist / build / Network / HTTP / Conduit / Util.o）

[2 of 12] Compiling Network.HTTP .Conduit.ConnInfo（Network / HTTP / Conduit / ConnInfo.hs，dist / build / Network / HTTP / Conduit / ConnInfo.o）

[3 of 12] Compiling Network.HTTP.Conduit.Types（ Network / HTTP / Conduit / Types.hs，dist / build / Network / HTTP / Conduit / Types.o）

：13：

 没有用于（读取UTC时间）的实例
来自数据类型声明的派生子句
可能的修正：
为（读取UTCTime）
添加实例声明或使用独立的派生实例声明
所以你可以自己指定实例上下文
当为（读取Cookie）派生实例时
  

无法安装http-conduit-1.9.6

cabal：错误：某些程序包未能安装：

http-conduit-1.9.6在构建阶段失败。例外是：

ExitFailure 1

我的工作平台是Ubuntu 14.04和cabal 1.20
谢谢。

解决方案

要构建http-conduit-1.9.6（在沙箱中），我必须：

1. 明确地添加依赖于network-uri的构建依赖于http-conduit.cabal



2. p>在Network / HTTP / Conduit / Types.hs中，通过导入Data.Time替换导入的Data.Time.Clock b b
   $ b

   在正确的轨道上： https://github.com/haskell/time/issues/7

让我知道如果这不行。

I'm trying to install http-conduit-1.9.6 (my Haskell application needs that version), and my "cabal install http-conduit-1.9.6" gives me the following error:

Building http-conduit-1.9.6...
Preprocessing library http-conduit-1.9.6...
[ 1 of 12] Compiling Network.HTTP.Conduit.Util ( Network/HTTP/Conduit/Util.hs, dist/build/Network/HTTP/Conduit/Util.o )
[ 2 of 12] Compiling Network.HTTP.Conduit.ConnInfo ( Network/HTTP/Conduit/ConnInfo.hs, dist/build/Network/HTTP/Conduit/ConnInfo.o )
[ 3 of 12] Compiling Network.HTTP.Conduit.Types ( Network/HTTP/Conduit/Types.hs, dist/build/Network/HTTP/Conduit/Types.o )

Network/HTTP/Conduit/Types.hs:239:13:

No instance for (Read UTCTime)  
  arising from the 'deriving' clause of a data type declaration  
Possible fix:
  add an instance declaration for (Read UTCTime)
  or use a standalone 'deriving instance' declaration,
       so you can specify the instance context yourself
When deriving the instance for (Read Cookie)

Failed to install http-conduit-1.9.6
cabal: Error: some packages failed to install:
http-conduit-1.9.6 failed during the building phase. The exception was:
ExitFailure 1

My work platform is Ubuntu 14.04 and cabal 1.20 Thanks.

解决方案

To build http-conduit-1.9.6 (in a sandbox), I've had to:

1. Explicitly add a dependency on network-uri in the build-depends of the http-conduit.cabal

2. In Network/HTTP/Conduit/Types.hs, replace the import Data.Time.Clock by import Data.Time

   (this issue in the time package put me on the right track: https://github.com/haskell/time/issues/7)

Let me know if that doesn't do it.

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