Haskell cabal 对文件和模块名称感到困惑

Question

在我的 haskell 项目中，我有以下目录结构（缺少一些条目，但与此问题无关）

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- quanthas\n   - quanthas.cabal\n   - src/\n      - QuantHas/\n         - Settings.hs\n

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我的 Settings.hs 文件包含此模块头

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module QuantHas.Settings(module QuantHas.Settings) where\n

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我的 cabal 文件看起来像这样

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Name:               QuantHas\nVersion:            0.0\nDescription:\n    QuantHas project is an attempt to port QuantLib to Haskell keeping the functional flavor of Haskell.\nLicense:            BSD3\nLicense-file:       LICENSE\nBuild-Type:         Simple\nCabal-Version:      >=1.10\n\nLibrary\n  Build-Depends:    base >= 3 && < 5, array >= 0.2\n  Exposed-modules:  QuantHas.Time.Frequency\n                QuantHas.Time.TimeUnit\n                QuantHas.Time.Period\n                QuantHas.Time.Date\n                QuantHas.Time.DayCounter\n                QuantHas.Time.BusinessDayConvention\n                QuantHas.Time.Calendar\n                QuantHas.Time.Calendars.UnitedKingdom\n                QuantHas.Time.Schedule\n                QuantHas.Settings\n                QuantHas.Require\n  default-language: Haskell2010                 \n  hs-source-dirs:   src\n  --  ghc-options:      -Wall\n\ntest-suite QuantHas-tests\n  type: exitcode-stdio-1.0\n  hs-source-dirs: testsuite\n  main-is: Tests.hs\n  default-language: Haskell2010  \n

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当我执行时

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cabal install --enable-tests\n

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我收到这条消息

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src/Quanthas/Settings.hs:17:8: error:\n   File name does not match module name:\n   Saw: \xe2\x80\x98QuantHas.Settings\xe2\x80\x99\n   Expected: \xe2\x80\x98Quanthas.Settings\xe2\x80\x99\n

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这似乎是错误的。然而，如果我们按照阴谋集团的预期去做呢？所以现在的 Settings.hs 模块头是

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module Quanthas.Settings(module Quanthas.Settings) where\n

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阴谋集团现在说

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src/QuantHas/Settings.hs:17:8: error:\n   File name does not match module name:\n   Saw: \xe2\x80\x98Quanthas.Settings\xe2\x80\x99\n   Expected: \xe2\x80\x98QuantHas.Settings\xe2\x80\x99\n

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正是在这个点上，我放弃并转向SO。谁能帮助我了解发生了什么事？

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版本信息：\n 平台：运行 MacOS 10.12.3 的 Macbook Pro\n Haskell：8.0.1\n Cabal：1.24.0.0

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谢谢！

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Answer 1

问题在于不同模块中的导入语句之一存在拼写错误。由于您使用的是不区分大小写的文件系统 (OS X)，GHC 能够找到模块内容，但在检查模块头时发现它与 import 语句不匹配并出错。