【发布时间】：2012-08-02 21:24:55
【问题描述】：
我需要在 cabal 文件和或 Login.hs 中进行哪些更改？ 请注意，此包中的其他 .hs 文件需要不同的管道版本。
(srchttps://github.com/gertcuykens/haskell-design)
gert@couchdb:~/Downloads/haskell-design/src$ ghci Chat.hs
GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
[1 of 2] Compiling Login ( Login.hs, interpreted )
Login.hs:27:9:
No instance for (Control.Monad.Trans.Control.MonadBaseControl
IO m0)
arising from a use of `withManager'
Possible fix:
add an instance declaration for
(Control.Monad.Trans.Control.MonadBaseControl IO m0)
In the expression: withManager
In the expression:
withManager
$ \ manager
-> FB.runFacebookT app manager
$ FB.getUserAccessTokenStep1 url perms
In an equation for `fbUrl':
fbUrl
= withManager
$ \ manager
-> FB.runFacebookT app manager
$ FB.getUserAccessTokenStep1 url perms
Login.hs:27:55:
Couldn't match expected type `http-conduit-1.4.1.8:Network.HTTP.Conduit.Manager.Manager'
with actual type `http-conduit-1.5.0.3:Network.HTTP.Conduit.Manager.Manager'
In the second argument of `FB.runFacebookT', namely `manager'
In the expression: FB.runFacebookT app manager
In the expression:
FB.runFacebookT app manager $ FB.getUserAccessTokenStep1 url perms
Login.hs:31:13:
No instance for (Control.Monad.Trans.Control.MonadBaseControl
IO m1)
arising from a use of `withManager'
Possible fix:
add an instance declaration for
(Control.Monad.Trans.Control.MonadBaseControl IO m1)
In the expression: withManager
In the expression:
withManager
$ \ manager
-> FB.runFacebookT app manager
$ do { t <- FB.getUserAccessTokenStep2 url [...];
u <- FB.getUser "me" [] (Just t);
.... }
In an equation for `fbEmail':
fbEmail c
= withManager
$ \ manager
-> FB.runFacebookT app manager
$ do { t <- FB.getUserAccessTokenStep2 url ...;
.... }
Login.hs:31:59:
Couldn't match expected type `http-conduit-1.4.1.8:Network.HTTP.Conduit.Manager.Manager'
with actual type `http-conduit-1.5.0.3:Network.HTTP.Conduit.Manager.Manager'
In the second argument of `FB.runFacebookT', namely `manager'
In the expression: FB.runFacebookT app manager
In the expression:
FB.runFacebookT app manager
$ do { t <- FB.getUserAccessTokenStep2 url [c];
u <- FB.getUser "me" [] (Just t);
return $ FB.userEmail u }
Login.hs:37:12:
No instance for (Control.Monad.Trans.Control.MonadBaseControl
IO m2)
arising from a use of `withManager'
Possible fix:
add an instance declaration for
(Control.Monad.Trans.Control.MonadBaseControl IO m2)
In the expression: withManager
In the expression:
withManager
$ \ manager
-> FB.runFacebookT app manager
$ do { t <- FB.getUserAccessTokenStep2 url [...];
u <- FB.getUser "me" [] (Just t);
.... }
In an equation for `fbName':
fbName c
= withManager
$ \ manager
-> FB.runFacebookT app manager
$ do { t <- FB.getUserAccessTokenStep2 url ...;
.... }
Login.hs:37:58:
Couldn't match expected type `http-conduit-1.4.1.8:Network.HTTP.Conduit.Manager.Manager'
with actual type `http-conduit-1.5.0.3:Network.HTTP.Conduit.Manager.Manager'
In the second argument of `FB.runFacebookT', namely `manager'
In the expression: FB.runFacebookT app manager
In the expression:
FB.runFacebookT app manager
$ do { t <- FB.getUserAccessTokenStep2 url [c];
u <- FB.getUser "me" [] (Just t);
return $ FB.userName u }
Failed, modules loaded: none.
Prelude>
【问题讨论】：
-
能否将代码转换为全部使用相同版本的
http-conduit？ -
运行
ghc-pkg check，由于两个管道版本，您可能有许多损坏的包。在任何情况下，如果甚至可以根据同一个包的多个版本构建一个包，那么这样做是非常不可取的，您应该针对同一个管道版本构建所有依赖项。 -
ghc-pkg check只给我分配这些东西Warning: haddock-interfaces: /home/gert/.cabal/share/doc/happstack-lite-7.2.0/html/happstack-lite.haddock doesn't exist or isn't a file -
我认为 happstack-server 使用 1.5 而 fb 使用 1.4？
标签： haskell dependencies dependency-management