为什么派生出现错误消息？

Question

我有一个带有以下行的Haskell文件：

{-# LANGUAGE DeriveGeneric #-}

但是，我在该行上收到以下错误消息：

Failed to parse result of calling cabal
Resolving dependencies...
Build profile: -w ghc-8.6.5 -O1
In order, the following will be built (use -v for more details):
 - haskell-translator-0.1.0.0 (exe:haskell-translator) (configuration changed)

Warning: haskell-translator.cabal:24:5:
unexpected 'a'
expecting space, "&&", white space, "||", comma or end of input

base >=4.12 && <4.13
async
cabal: Failed parsing "./haskell-translator.cabal".

以下是我的.cabal文件的内容：

name:                haskell-translator
version:             0.1.0.0
-- synopsis:
-- description:
license:             BSD3
license-file:        LICENSE
author:              saad.shaikh
maintainer:          [email protected]
-- copyright:
-- category:
build-type:          Simple
extra-source-files:  CHANGELOG.md
cabal-version:       >=1.10

executable haskell-translator
  main-is:             Main.hs
  -- other-modules:
  -- other-extensions:
  build-depends:       
    base >=4.12 && <4.13
    async>=1.2.0 && <1.3
    haskell-translator-0.1.0.0
  -- hs-source-dirs:
  default-language:    Haskell2010

错误消息的原因是什么？

Answer 1

您的Cabal文件在build依赖 e节上存在一些问题，您应该通过逗号分开项目，并使用Constrainst So == 0.1.0.0.0，而不是-0.1.0.0：

build-depends:
    base >=4.12 && <4.13
  , async>=1.2.0 && <1.3
  , haskell-translator == 0.1.0.0