当我尝试通过堆栈安装 ghc-mod 时，我最终遇到了这些依赖项冲突
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)
cabal-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 /Users/mo/.stack/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
如果我尝试像这样添加建议的额外部门
extra-deps:
- 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
- process-1.4.3.0
- either-4.4.1.1
- free-4.12.4
我最终有一个这样的循环
Error: While constructing the build plan, the following exceptions were encountered:
In the dependencies for ghc-mod-5.8.0.0:
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)
ghc-8.2.2 from stack configuration does not match >=7.6 && <8.2
needed since ghc-mod is a build target.
In the dependencies for haskell-src-exts-util-0.2.3:
haskell-src-exts-1.19.1 from stack configuration does not match >=1.20.0 (latest matching version is 1.20.2)
needed due to ghc-mod-5.8.0.0 -> haskell-src-exts-util-0.2.3
In the dependencies for hlint-2.0.15:
haskell-src-exts-1.19.1 from stack configuration does not match >=1.20 && <1.21 (latest matching version is 1.20.2)
needed due to ghc-mod-5.8.0.0 -> hlint-2.0.15
Some different approaches to resolving this:
* Set 'allow-newer: true' to ignore all version constraints and build anyway.
* 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 /Users/mo/.stack/global-project/stack.yaml:
- base-4.9.1.0
- haskell-src-exts-1.20.2
如果我把 - haskell-src-exts-1.20.2 他们要求我放 - haskell-src-exts-1.19.1 回来，反之亦然，我不知道如何处理这种依赖冲突，而且我也尝试运行堆栈解析器，但它没有让我到任何地方
问题是 ghc-mod 不支持较新版本的 GHC，我相信最后支持的版本是 GHC 8.0。您可以尝试将堆栈解析器更改为 lts-8.24 或 nightly-2017-06-28（请参阅上列出的快照）ghc-mod 的 Stackage 页面).
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