无法安装GHC-Mod

Question

你好我们正在尝试为vscode安装ghc-mod，我遇到了这个问题：

**$ stack install ghc-mod**
Populated index cache.

Error: While constructing the build plan, the following exceptions were encountered:

In the dependencies for ghc-mod-5.8.0.0:
    Cabal-2.0.1.1 from stack configuration does not match >=1.18 && <1.25 (latest matching version
                  is 1.24.2.0)
    base-4.10.1.0 from stack configuration does not match >=4.6.0.1 && <4.10  (latest matching
                  version is 4.9.1.0)
    mcabal-helper must match <0.8 && >=0.7.3.0, but the stack configuration has no specified version
                 (latest matching version is 0.7.3.0)
    extra-1.6.8 from stack configuration does not match <1.6 && >=1.4  (latest matching version
                is 1.5.3)
    ghc-8.2.2 from stack configuration does not match >=7.6 && <8.2
    haskell-src-exts-1.20.2 from stack configuration does not match <1.20 && >=1.18  (latest
                            matching version is 1.19.1)
    hlint-2.1.6 from stack configuration does not match <2.1 && >=2.0.8  (latest matching version
                is 2.0.15)
    monad-journal-0.8.1 from stack configuration does not match <0.8 && >=0.4  (latest matching
                        version is 0.7.2)
    optparse-applicative-0.14.2.0 from stack configuration does not match >=0.13.0.0 && <0.14
                                  (latest matching version is 0.13.2.0)
needed since ghc-mod is a build target.

Some different approaches to resolving this:

  * Consider trying 'stack solver', which uses the cabal-install solver to attempt to find some
    working build configuration. This can be convenient when dealing with many complicated
    constraint errors, but results may be unpredictable.

  * Recommended action: try adding the following to your extra-deps
    in C:\sr\global-project\stack.yaml:

- Cabal-1.24.2.0
- base-4.9.1.0
- cabal-helper-0.7.3.0
- extra-1.5.3
- haskell-src-exts-1.19.1
- hlint-2.0.15
- monad-journal-0.7.2
- optparse-applicative-0.13.2.0

Plan construction failed.

我试过stack install ghc-mod和cabal install ghc-mod无济于事。我总是得到这个plan construction failed.Any想法如何处理它？ P.S：我已经更新了堆栈和cabal。

按照用户的建议后，我将文件添加到C:\sr\global-project/stack.yaml，现在它看起来像这样：

全球stack.yaml：

packages: []
resolver: lts-11.13
 Cabal-1.24.2.0
 base-4.9.1.0
 cabal-helper-0.7.3.0
 extra-1.5.3
 haskell-src-exts-1.19.1
 hlint-2.0.15
 monad-journal-0.7.2
 optparse-applicative-0.13.2.0

添加所有这些文件后，运行stack install ghc-mod时出现以下错误：

$ stack install ghc-mod

    Unable to load custom resolver lts-11.13 Cabal-1.24.2.0 base-4.9.1.0 cabal-helper-0.7.3.0 extra-1.5.3 haskell-src-exts-1.19.1 hlint-2.0.15 monad-journal-0.7.2 optparse-applicative-0.13.2.0 from local file:
      C:\sr\global-project\lts-11.13 Cabal-1.24.2.0 base-4.9.1.0 cabal-helper-0.7.3.0 extra-1.5.3 haskell-src-exts-1.19.1 hlint-2.0.15 monad-journal-0.7.2 optparse-applicative-0.13.2.0
    Exception: InvalidYaml (Just (YamlException "Yaml file not found: C:\\sr\\global-project\\lts-11.13 Cabal-1.24.2.0 base-4.9.1.0 cabal-helper-0.7.3.0 extra-1.5.3 haskell-src-exts-1.19.1 hlint-2.0.15 monad-journal-0.7.2 optparse-applicative-0.13.2.0"))

Answer 1

问题是ghc-mod does not work on ghc-8.2。支持ghc-mod的最新Stack解析器似乎是lts-9.21。

ghc-mod必须使用您正在使用的相同版本的GHC进行编译，因此现在将您限制为8.0。

Answer 2

使用最新工具链的大多数人显然没有使用ghc-mod，否则这样就行了。考虑放弃它。