使用 Stack 安装 Aeson 包

Question

要使用 Json，我想安装 Aeson 包。

在package.yaml我添加- aeson到该dependencies:部分的文件中，我收到了一大堆错误，我在网上找不到这些错误，例如：“但是这个 GHC 启动包已被修剪”。

我试图理解错误，但我不理解其中任何一个。例如对于第一个：如果我stack ls dependencies得到text 1.2.4.0，它符合匹配，那么为什么它不起作用？

有没有办法让 Stack 为我安装东西，而不必编辑 yaml 文件然后遇到问题？（stack install似乎没有做任何事情）

完整的错误：

PS D:\Documents\Programming\Unity\Poging8_(catan)\HaskellServer> stack build

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

In the dependencies for aeson-1.4.7.1:
    text must match >=1.2.3.0 && <1.3, but this GHC boot package has been pruned (issue #4510); you need to add the
         package explicitly to extra-deps  (latest matching version is 1.2.4.0)
needed due to HaskellCatanServer-0.1.0.0 -> aeson-1.4.7.1

In the dependencies for attoparsec-0.13.2.4:
    text must match >=1.1.1.3, but this GHC boot package has been pruned (issue #4510); you need to add the package
         explicitly to extra-deps  (latest matching version is 1.2.4.0)
needed due to HaskellCatanServer-0.1.0.0 -> attoparsec-0.13.2.4

In the dependencies for ghc-boot-th-8.6.5:
    base-4.13.0.0 from stack configuration does not match >=4.7 && <4.13  (latest matching version is 4.12.0.0)
needed due to HaskellCatanServer-0.1.0.0 -> ghc-boot-th-8.6.5

In the dependencies for hashable-1.3.0.0:
    text must match >=0.12 && <1.3, but this GHC boot package has been pruned (issue #4510); you need to add the package
         explicitly to extra-deps  (latest matching version is 1.2.4.0)
needed due to HaskellCatanServer-0.1.0.0 -> hashable-1.3.0.0

In the dependencies for scientific-0.3.6.2:
    text must match >=0.8, but this GHC boot package has been pruned (issue #4510); you need to add the package
         explicitly to extra-deps  (latest matching version is 1.2.4.0)
needed due to HaskellCatanServer-0.1.0.0 -> scientific-0.3.6.2

In the dependencies for template-haskell-2.14.0.0:
    base-4.13.0.0 from stack configuration does not match >=4.9 && <4.13  (latest matching version is 4.12.0.0)
needed due to HaskellCatanServer-0.1.0.0 -> template-haskell-2.14.0.0

In the dependencies for time-1.8.0.4:
    base-4.13.0.0 from stack configuration does not match >=4.7 && <4.13  (latest matching version is 4.12.0.0)
needed due to HaskellCatanServer-0.1.0.0 -> time-1.8.0.4

In the dependencies for uuid-types-1.0.3:
    text must match >=1 && <1.3, but this GHC boot package has been pruned (issue #4510); you need to add the package
         explicitly to extra-deps  (latest matching version is 1.2.4.0)
needed due to HaskellCatanServer-0.1.0.0 -> uuid-types-1.0.3

Some different approaches to resolving this:

  * Build requires unattainable version of base. Since base is a part of GHC, you most likely need to use a different
    GHC version with the matching base.

Plan construction failed.

附加信息：

在package.yaml我有依赖项：

- base >= 4.7 && < 5
- network
- bytestring
- aeson

我没有手动编辑过stack.yaml，我有解析器 lts-16.3 和 extra-deps：

- ghc-8.6.5@sha256:3591225289bdf8cf8f62b10f2aebc9ea3e25a15294545a5312a419e0317784f9,13976
- ghc-boot-8.6.5@sha256:8b608d2f36aad99a37a7d1b70319d43195128de6485b15fa7d4638b2942ce2a2,1772
- ghc-boot-th-8.6.5@sha256:c120f0d15944e770e2b698f5139f0003a86f9e25e5d1a7c6631e442129232748,1075
- ghci-8.6.5@sha256:886e52e6ab43b0de39fd5d92d8d1a5d7fac04c0f145c62b39baae04476208bd9,2126
- template-haskell-2.14.0.0@sha256:e3747ae9e2aeec160196706dd470b5fc4175678ec4136bcec9124534f67d83bc,1724
- time-1.8.0.4@sha256:3f6eddf238b828eb4f82683acce1c3afe64784f0d20114239b738c123316c85c,5494

stack ls dependencies

Win32 2.6.1.0
aeson 1.4.7.1
array 0.5.4.0
attoparsec 0.13.2.4
base 4.13.0.0
base-compat 0.11.1
base-compat-batteries 0.11.1
base-orphans 0.8.2
binary 0.8.7.0
bytestring 0.10.10.0
containers 0.6.2.1
deepseq 1.4.4.0
dlist 0.8.0.8
filepath 1.4.2.1
ghc-boot-th 8.6.5
ghc-prim 0.5.3
hashable 1.3.0.0
integer-gmp 1.0.2.0
integer-logarithms 1.0.3
network 3.1.1.1
pretty 1.1.3.6
primitive 0.7.0.1
random 1.1
rts 1.0
scientific 0.3.6.2
tagged 0.8.6
template-haskell 2.14.0.0
text 1.2.4.0
th-abstraction 0.3.2.0
time 1.8.0.4
time-compat 1.9.3
transformers 0.5.6.2
unordered-containers 0.2.10.0
uuid-types 1.0.3
vector 0.12.1.2

Answer 1

lts所以你的问题是和版本之间不匹配extra-deps。正如@arrowd评论的那样，解决方案是删除extra-deps部分......让我详细解释一下原因：

• 每个lts（又名snapshot）都有一个关联的 ghc 版本。对于lts-16.3，ghc-8.8.3您可以在链接的文档中查看这样的版本。

• 当您在 中编写依赖项时package.yaml，stack将使用所选中定义的版本lts，并且将从服务器下载它stackage。例如，在链接的文档中，您可以搜索aesonpackage.json。使用的版本lts-16.3是aeson-1.4.7.1

• a 中的所有软件包版本lts都保证能够很好地协同工作，而不会出现依赖性问题。（我认为由于系统包的原因，堆栈网络中记录了一些例外情况，但我不太确定）

• 问题随之而来extra-deps。直接从服务器下载hackage，不保证依赖兼容性。就您而言，一个额外的部门是ghc-8.6.5. ghc-8.8.3显然，快照中定义的编译器版本与您想要作为额外依赖的版本之间存在依赖关系问题ghc-8.6.5

希望它能澄清一些stack术语。