从单个堆栈项目生成多个可执行文件 - HASKELL

Question

我正在尝试从名为“Trial”的同一个 haskell 堆栈项目生成两个可执行文件。\n我的堆栈项目的结构如下：

\n\n

$~/trial$ tree\n.\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 app\n\xe2\x94\x82\xc2\xa0\xc2\xa0 \xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 First.hs\n\xe2\x94\x82\xc2\xa0\xc2\xa0 \xe2\x94\x94\xe2\x94\x80\xe2\x94\x80 Second.hs\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 ChangeLog.md\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 LICENSE\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 package.yaml\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 README.md\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 Setup.hs\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 src\n\xe2\x94\x82\xc2\xa0\xc2\xa0 \xe2\x94\x94\xe2\x94\x80\xe2\x94\x80 Lib.hs\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 stack.yaml\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 stack.yaml.lock\n\xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80 test\n\xe2\x94\x82\xc2\xa0\xc2\xa0 \xe2\x94\x94\xe2\x94\x80\xe2\x94\x80 Spec.hs\n\xe2\x94\x94\xe2\x94\x80\xe2\x94\x80 trial.cabal\n

\n\n

我提到了一个类似的问题：从单个项目生成多个可执行文件\n并且我相应地编辑了我的项目的\'.cabal\'文件...\n
\nTrial.cabal：

\n\n

\n-- This file has been generated from package.yaml by hpack version 0.31.2.\n--\n-- see: https://github.com/sol/hpack\n--\n-- hash: ff6e15c6d7d9cfb9abc0b852e25bb43f131a2a80acf4b08356d5c574b951fb8c\n\nname:           trial\nversion:        0.1.0.0\ndescription:    Please see the README on GitHub at <https://github.com/githubuser/trial#readme>\nhomepage:       https://github.com/githubuser/trial#readme\nbug-reports:    https://github.com/githubuser/trial/issues\nauthor:         Author name here\nmaintainer:     example@example.com\ncopyright:      2020 Author name here\nlicense:        BSD3\nlicense-file:   LICENSE\nbuild-type:     Simple\nextra-source-files:\n    README.md\n    ChangeLog.md\n\nsource-repository head\n  type: git\n  location: https://github.com/githubuser/trial\n\nlibrary\n  exposed-modules:\n      Lib\n  other-modules:\n      Paths_trial\n  hs-source-dirs:\n      src\n  build-depends:\n      base >=4.7 && <5\n\n  default-language: Haskell2010\n\nexecutable first\n  main-is: First.hs\n  other-modules:\n      Paths_trial\n\n  hs-source-dirs:   app\n  ghc-options:      -O2 -threaded -with-rtsopts=-N -main-is First.hs\n  build-depends:\n      base >=4.7 && <5\n    , trial\n  default-language: Haskell2010\n\nexecutable second\n  main-is: Second.hs\n  other-modules:\n      Paths_trial\n  hs-source-dirs:   app\n  ghc-options: -threaded -rtsopts -with-rtsopts=-N -main-is Second.hs\n  build-depends:\n      base >=4.7 && <5\n    , trial\n  default-language: Haskell2010\n\ntest-suite trial-test\n  type: exitcode-stdio-1.0\n  main-is: Spec.hs\n  other-modules:\n      Paths_trial\n  hs-source-dirs:\n      test\n  ghc-options: -threaded -rtsopts -with-rtsopts=-N\n  build-depends:\n      base >=4.7 && <5\n    , trial\n  default-language: Haskell2010\n

\n\n

app/First.hs 和 app/Second.hs 的内容相同，如下：

\n\n

import Lib\nmain :: IO()\nmain = someFunc\n

\n\n

src/Lib.hs内容如下：

\n\n

module Lib\n    ( someFunc\n    ) where\n\nsomeFunc :: IO ()\nsomeFunc = putStrLn "someFunc"\n

\n\n

当我构建项目时，出现以下错误：

\n\n

 error:\n    output was redirected with -o, but no output will be generated\nbecause there is no Second module.\n\n\n--  While building package trial-0.1.0.0 using:\n

\n