Haskell 安装scion浏览器时出错
尝试安装scion browser软件包时出现以下错误，如下所示：Haskell 安装scion浏览器时出错,haskell,cabal,Haskell,Cabal,尝试安装scion browser软件包时出现以下错误，如下所示： % cabal install scion-browser-0.2.9 <snipped> [23 of 23] Compiling Main ( src/Main.hs, dist/build/scion-browser/scion-browser-tmp/Main.o ) src/Main.hs:31:24: No instance for (MonadException Bro
% cabal install scion-browser-0.2.9
<snipped>
[23 of 23] Compiling Main ( src/Main.hs, dist/build/scion-browser/scion-browser-tmp/Main.o )
src/Main.hs:31:24:
No instance for (MonadException BrowserM)
arising from a use of `getInputLine'
Possible fix:
add an instance declaration for (MonadException BrowserM)
In a stmt of a 'do' block: maybeLine <- getInputLine ""
In the expression:
do { maybeLine <- getInputLine "";
case maybeLine of {
Nothing -> return ()
Just line -> do { ... } } }
In an equation for `loop':
loop
= do { maybeLine <- getInputLine "";
case maybeLine of {
Nothing -> return ()
Just line -> ... } }
cabal: Error: some packages failed to install:
scion-browser-0.2.9 failed during the building phase. The exception was:
ExitFailure 1
%cabal安装scion-browser-0.2.9
[23/23]编译Main（src/Main.hs，dist/build/scion-browser/scion-browser-tmp/Main.o）
src/Main.hs:31:24：
没有（MonadException BrowserM）的实例
由于使用“getInputLine”而产生
可能的解决方案：
为（MonadException BrowserM）添加实例声明
在'do'块的stmt中：maybeLine do{…}
在“循环”的方程式中：
环
=do{maybeLine返回（）
只需行->…}
阴谋集团：错误：某些软件包未能安装：
scion-browser-0.2.9在构建阶段失败。例外情况是：
退出失败1
StateThaskeline<0.7Control.Monad.StatehaskelinemtlStateT变形金刚haskelineControl.Monad.Trans.State.StrictControl.Monad.StatemtlControl.Monad.Trans.State.Lazyinstance MonadException m => MonadException (StateT s m) where
controlIO f = StateT $ \s -> controlIO $ \(RunIO run) -> let
run' = RunIO (fmap (StateT . const) . run . flip runStateT s)
in fmap (flip runStateT s) $ f run'
System.Console.Haskeline.MonadExceptionStateTcabal install --constraint="haskeline < 0.7" scion-browser
cabal安装--constraint=“haskeline<0.7”scion浏览器
scion浏览器Control.Monad.State.Stricthaskeline-0.7.0.0StateThaskeline<0.7Control.Monad.StatehaskelinemtlStateT变形金刚haskelineControl.Monad.Trans.State.StrictControl.Monad.StatemtlControl.Monad.Trans.State.Lazyinstance MonadException m => MonadException (StateT s m) where
controlIO f = StateT $ \s -> controlIO $ \(RunIO run) -> let
run' = RunIO (fmap (StateT . const) . run . flip runStateT s)
in fmap (flip runStateT s) $ f run'
System.Console.Haskeline.MonadExceptionStateTcabal install --constraint="haskeline < 0.7" scion-browser
cabal安装--constraint=“haskeline<0.7”scion浏览器
另一个解决方案是将
scion浏览器Control.Monad.State.Stricthaskeline-0.7.0.0ghc-pkg-list-mtlghc-pkg-list-transformershaskelinehaskelineControl.Monad.StrictStateTControl.Monad.Strict