Question

我正在尝试关注the servant tutorial并且我遇到了Cabal错误RecyclerView。这是我的list = list.stream().distinct().collect(Collectors.toList());文件（我是从servant's github repo获得的）：

Unknown fields: build-tool-depends

tutorial.cabal能够构建这个吗？这是我得到的输出：

name:                tutorial
version:             0.10
synopsis:            The servant tutorial
homepage:            http://haskell-servant.readthedocs.org/
license:             BSD3
license-file:        LICENSE
author:              Servant Contributors
maintainer:          haskell-servant-maintainers@googlegroups.com
build-type:          Simple
cabal-version:       >=1.10

library
  exposed-modules:     Server
  build-depends:       base == 4.*
                     , base-compat
                     , text
                     , aeson
                     , aeson-compat
                     , blaze-html
                     , directory
                     , blaze-markup
                     , containers
                     , servant == 0.11.*
                     , servant-server == 0.11.*
                     , servant-client == 0.11.*
                     , servant-docs == 0.11.*
                     , servant-js >= 0.9 && <0.10
                     , warp
                     , http-api-data
                     , http-media
                     , lucid
                     , time
                     , string-conversions
                     , bytestring
                     , attoparsec
                     , mtl
                     , random
                     , js-jquery
                     , wai
                     , http-types
                     , transformers
                     , markdown-unlit >= 0.4
                     , http-client
  default-language:    Haskell2010
  ghc-options:         -Wall -pgmL markdown-unlit
  build-tool-depends: markdown-unlit:markdown-unlit

test-suite spec
  type: exitcode-stdio-1.0
  ghc-options: -Wall
  default-language: Haskell2010
  hs-source-dirs: test
  main-is: Spec.hs
  other-modules: JavascriptSpec
  build-depends: base == 4.*
               , tutorial
               , hspec
               , hspec-wai
               , string-conversions

cabal build给出：

➜  servant cabal build
Package has never been configured. Configuring with default flags. If this
fails, please run configure manually.
Warning: tutorial.cabal: Unknown fields: build-tool-depends (line 46)
Fields allowed in this section:
...

我不认为我的cabal --version文件对此错误很重要，但这只是以防万一：

cabal-install version 1.24.0.2
compiled using version 1.24.2.0 of the Cabal library

非常欢迎任何帮助！

Answer 1

build-tool-depends是cabal 2.0的新领域。见What's new in Cabal/cabal-install 2.0

新build-tool-depends字段，替换build-tools并具有更好的语义定义（#3708，#1541）。 cabal-install现在将安装所需的构建工具并自动将它们添加到PATH。

Cabal错误`未知字段：build-tool-depends`试图遵循仆人教程

1 个答案: