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haskell - cabal new-install hakyll 无法建立依赖关系

问题描述

安装后ghcup，我尝试hakyll使用命令安装cabal new-install hakyll。这会导致依赖text-conversions库中的构建错误：

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？

标签： haskellcabalhakyll

解决方案

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

一个短期的解决方案是添加一个约束，使用命令--constraint="base16-bytestring < 1"中的标志cabal install，或者将行添加constraints: base16-bytestring < 1到文件~/.cabal/config中。（链接到阴谋集团文档的相关部分）

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

理想情况下（不一定），应该发布一个新版本的text-conversionscompatible with ，但仍然需要修复现有版本的界限，以避免出现损坏的构建计划。base16-bytestring-1.0.0.0

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