Question

如何在没有基础的情况下使用cabal repl（ghci）？

以下设计示例显示错误

-- minimal.hs
module Minimal where

myId :: a -> a
myId x = x

和

-- minimal.cabal
name: minimal
version: 0.0.1
build-type: Simple
cabal-version: >= 1.10

library
  exposed-modules: Minimal
  --build-depends: base
  default-language: Haskell2010
  default-extensions:  NoImplicitPrelude

cabal build成功

$ cabal build
Building minimal-0.0.1...
Preprocessing library minimal-0.0.1...
[1 of 1] Compiling Minimal          ( Minimal.hs, dist\build\Minimal.o )

但是cabal repl失败了

$ cabal repl
Preprocessing library minimal-0.0.1...
GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help

<interactive>:1:6: error:
    Not in scope: `System.IO.hSetBuffering'
    No module named `System.IO' is imported.

<interactive>:1:30: error:
    Not in scope: `System.IO.stdin'
    No module named `System.IO' is imported.

<interactive>:1:46: error:
    Not in scope: data constructor `System.IO.NoBuffering'
    No module named `System.IO' is imported.

<interactive>:1:70: error:
    Not in scope: `System.IO.hSetBuffering'
    No module named `System.IO' is imported.

<interactive>:1:94: error:
    Not in scope: `System.IO.stdout'
    No module named `System.IO' is imported.

<interactive>:1:111: error:
    Not in scope: data constructor `System.IO.NoBuffering'
    No module named `System.IO' is imported.

<interactive>:1:135: error:
    Not in scope: `System.IO.hSetBuffering'
    No module named `System.IO' is imported.

<interactive>:1:159: error:
    Not in scope: `System.IO.stderr'
    No module named `System.IO' is imported.

<interactive>:1:176: error:
    Not in scope: data constructor `System.IO.NoBuffering'
    No module named `System.IO' is imported.

如果我恢复“build-depends：base”，如果按预期工作。

$ cabal repl
Preprocessing library minimal-0.0.1...
GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Minimal          ( Minimal.hs, interpreted )
Ok, modules loaded: Minimal.
*Minimal>

我知道只要保持“build-depends：base”就能让它发挥作用，但这不是我所要求的。

注意：这也适用于堆栈

如何在没有基础的情况下使用“cabal repl”

0 个答案: