无法为Cabal项目添加digestive-functors库，求构建解决方案

问题背景 #

原本可正常构建的Cabal项目，添加text >=2.0.0和digestive-functors >=0.8.3.0依赖后，出现依赖解析失败，无法完成构建。

项目Cabal配置 #

library
    import:           warnings
    exposed-modules:  MyLib
                    , Logger
                    , Domain.Auth
                    , Domain.Validation
                    , Adapter.InMemory.Auth
                    , Adapter.PostgreSQL.Auth
                    , Adapter.Redis.Auth
                    , Adapter.RabbitMQ.Common
                    , Adapter.RabbitMQ.Auth

    default-extensions: ConstraintKinds
                      , FlexibleContexts
                      , NoImplicitPrelude
                      , OverloadedStrings
                      , QuasiQuotes
                      , TemplateHaskell

    -- other-modules:
    -- other-extensions:
    build-depends:    base >= 4.18.0.0
                    , katip >= 0.8.7.0
                    , text >= 2.0.0
                    , digestive-functors >= 0.8.3.0
                    , string-random 
                    , mtl
                    , data-has
                    , classy-prelude
                    , pcre-heavy
                    , time
                    , time-lens
                    , resource-pool
                    , postgresql-simple
                    , exceptions
                    , postgresql-migration
                    , extra
                    , hedis
                    , amqp
                    , aeson
                    , lifted-base
                    , scotty
                    , http-types
                    , cookie
                    , wai
                    , wai-extra
                    , blaze-builder

    hs-source-dirs:   src
    default-language: GHC2021

构建错误日志 #

cabal build
Resolving dependencies...
Error: [Cabal-7107]
Could not resolve dependencies:
[__0] trying: practical-web-dev-ghc-0.1.0.0 (user goal)
[__1] trying: text-2.1.1/installed-05f2 (dependency of practical-web-dev-ghc)
[__2] trying: template-haskell-2.22.0.0/installed-e0ca (dependency of text)
[__3] next goal: digestive-functors (dependency of practical-web-dev-ghc)
[__3] rejecting: digestive-functors-0.8.4.2 (conflict: text => bytestring==0.12.1.0/installed-5f32, digestive-functors => bytestring>=0.9 && <0.12)
[__3] rejecting: digestive-functors-0.8.4.0 (conflict: text => bytestring==0.12.1.0/installed-5f32, digestive-functors => bytestring>=0.9 && <0.11)
[__3] rejecting: digestive-functors-0.8.3.0 (conflict: text => base==4.20.0.0/installed-380b, digestive-functors => base>=4 && <4.11)
[__3] rejecting: digestive-functors-0.8.2.0 (conflict: practical-web-dev-ghc => digestive-functors>=0.8.3.0)
[__3] skipping: digestive-functors; 0.8.1.1, 0.8.1.0, 0.8.0.1, 0.8.0.0, 0.7.1.5, 0.7.1.4, 0.7.1.3, 0.7.1.2, 0.7.1.1, 0.7.1.0, 0.7.0.0, 0.6.2.0, 0.6.1.1, 0.6.1.0, 0.6.0.1, 0.6.0.0, 0.5.0.4, 0.5.0.3, 0.5.0.2, 0.5.0.1, 0.5.0.0, 0.4.1.2, 0.4.1.1, 0.4.1.0, 0.4.0.0, 0.3.2.1, 0.3.1.0, 0.3.0.2, 0.3.0.1, 0.3.0.0, 0.2.1.0, 0.2.0.1, 0.2.0.0, 0.1.0.2, 0.1.0.1, 0.1.0.0, 0.0.2.1, 0.0.2.0, 0.0.1 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=0.8.3.0' from 'practical-web-dev-ghc')
[__3] fail (backjumping, conflict set: digestive-functors, practical-web-dev-ghc, text)
After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: text, practical-web-dev-ghc, digestive-functors, template-haskell, base
Try running with --minimize-conflict-set to improve the error message.

已尝试调整digestive-functors和text的多个版本，但问题未解决。

解决方案 #

方案1：降级text版本适配旧版digestive-functors #

从错误日志可知，digestive-functors 0.8.x系列的依赖限制较严格：

• 0.8.3.0要求base <4.11，但当前项目使用base >=4.18
• 0.8.4.x要求bytestring <0.12，但text 2.x依赖bytestring >=0.12

修改Cabal配置中的build-depends部分，调整text和digestive-functors的版本范围：

text >=1.2 && <2.0,
digestive-functors >=0.8.4.2 && <0.9

text 1.x系列依赖的bytestring版本符合digestive-functors 0.8.4.2的要求，同时能兼容项目的base版本。

方案2：升级digestive-functors到支持新依赖的版本 #

digestive-functors 0.9.x及以上版本已更新依赖限制，支持base >=4.11和bytestring >=0.12，可直接适配text 2.x和当前项目的base版本。修改依赖如下：

text >=2.0.0,
digestive-functors >=0.9.0.0

注意：需确认项目代码兼容digestive-functors 0.9.x的API变化。

方案3：锁定依赖版本避免解析冲突 #

修改依赖后，执行以下命令锁定所有依赖的具体版本：

cabal freeze

生成cabal.project.freeze文件后，再执行cabal build即可完成构建。

内容的提问来源于stack exchange，提问作者user51