cabal new-install hakyll 无法建立依赖关系

Question

安装 ghcup 后，我尝试使用命令 cabal new-install hakyll 安装 hakyll。这会导致依赖项中的构建错误，text-conversions library:

Failed to build text-conversions-0.3.0.
Build log (
/home/me/.cabal/logs/ghc-8.8.4/text-conversions-0.3.0-e3c3dbd414a885ff0e8ec81ad4c2c319c5dff5772ce6392ac561833941ecfd06.log
):
Configuring library for text-conversions-0.3.0..
Preprocessing library for text-conversions-0.3.0..
Building library for text-conversions-0.3.0..
[1 of 1] Compiling Data.Text.Conversions ( src/Data/Text/Conversions.hs, dist/build/Data/Text/Conversions.o )

src/Data/Text/Conversions.hs:152:5: error:
    • Couldn't match expected type ‘Either String B.ByteString’
                  with actual type ‘(B.ByteString, [Char])’
    • In the pattern: (bs, "")
      In a case alternative: (bs, "") -> Just $ Base16 bs
      In the expression:
        case Base16.decode (T.encodeUtf8 txt) of
          (bs, "") -> Just $ Base16 bs
          (_, _) -> Nothing
    |
152 |     (bs, "") -> Just $ Base16 bs
    |     ^^^^^^^^

src/Data/Text/Conversions.hs:153:5: error:
    • Couldn't match expected type ‘Either String B.ByteString’
                  with actual type ‘(a1, b1)’
    • In the pattern: (_, _)
      In a case alternative: (_, _) -> Nothing
      In the expression:
        case Base16.decode (T.encodeUtf8 txt) of
          (bs, "") -> Just $ Base16 bs
          (_, _) -> Nothing
    |
153 |     (_,  _)  -> Nothing
    |     ^^^^^^^

src/Data/Text/Conversions.hs:164:5: error:
    • Couldn't match expected type ‘Either String BL.ByteString’
                  with actual type ‘(BL.ByteString, [Char])’
    • In the pattern: (bs, "")
      In a case alternative: (bs, "") -> Just $ Base16 bs
      In the expression:
        case Base16L.decode (TL.encodeUtf8 $ TL.fromStrict txt) of
          (bs, "") -> Just $ Base16 bs
          (_, _) -> Nothing
    |
164 |     (bs, "") -> Just $ Base16 bs
    |     ^^^^^^^^

src/Data/Text/Conversions.hs:165:5: error:
    • Couldn't match expected type ‘Either String BL.ByteString’
                  with actual type ‘(a0, b0)’
    • In the pattern: (_, _)
      In a case alternative: (_, _) -> Nothing
      In the expression:
        case Base16L.decode (TL.encodeUtf8 $ TL.fromStrict txt) of
          (bs, "") -> Just $ Base16 bs
          (_, _) -> Nothing
    |
165 |     (_,  _)  -> Nothing
    |     ^^^^^^^
cabal: Failed to build text-conversions-0.3.0 (which is required by
exe:hakyll-init from hakyll-4.13.4.0). See the build log above for details.

知道出了什么问题以及如何解决吗？

Answer 1

text-conversions 软件包与本周发布的最新版本 base16-bytestring 不兼容。所以构建失败。

一个short-term解决方案是添加一个约束，在cabal install命令中使用标志--constraint="base16-bytestring < 1"，或者将行constraints: base16-bytestring < 1添加到文件~/.cabal/config. (Link to relevant section of the cabal documentation)

从长远来看，必须修复 text-conversions 包以在依赖项 base16-bytestring < 1 上添加版本上限。您可以在以下问题中询问事物的状态：

理想情况下（不一定），应该发布与 base16-bytestring-1.0.0.0 兼容的 text-conversions 的新版本，但仍然有必要修复现有版本的边界以避免拾取损坏的构建计划。

cabal new-install hakyll 无法建立依赖关系

cabal new-install hakyll is fails to build dependency

haskell

cabal

hakyll