ghci:模块"main:Main"在多个文件中定义-在新的小型堆栈init ghci包中 [英] ghci: module ‘main:Main’ is defined in multiple files - in new small stack init build ghci package

问题描述

我尝试使用vscode设置基于 stack 的Haskell IDE，并从使用 stack init 创建的小项目开始，然后在 src <中添加第二个模块./code>，并在 package.yaml 中添加了一些依赖项.它可以正常运行，但是当我启动 stack ghci 时，我会发出警告:

 警告:多个文件使用相同的模块名称:*在以下路径中找到Paths_primo*/home/frank/Workspace11/primo/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/autogen/Paths_primo.hs(primo:lib)*/home/frank/Workspace11/primo/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/primo-exe/autogen/Paths_primo.hs(primo:exe:primo-exe)* * * * * * * * *GHCi版本8.10.4:https://www.haskell.org/ghc/:?求助[1 of 3]编译库(/home/frank/Workspace11/primo/src/Lib.hs，已解释)[2 of 3]编译YamlRead(/home/frank/Workspace11/primo/src/YamlRead.hs，已解释)[3之3]编译Main(/home/frank/Workspace11/primo/app/Main.hs，已解释)好了，加载了三个模块. 

似乎与 autogen 和 Paths_primo ( primo 是软件包的名称)相混淆.我在做什么错了?

一般问题:清理堆栈项目以重新开始"的正确方法是什么?经过一些实验?删除 cabal 文件和 stack-work 目录是正确的.什么是 stack.yaml 和'stack.yaml.lock`?

解决方案

这似乎是在堆栈问题#5439 ，其根本原因是 hpack问题#303 .消除警告的一种解决方法是，通过在 package中的以下部分中添加以下内容，以禁用 primo-exe 可执行文件的 Paths _ 模块的生成.yaml :

 何时:-条件:假其他模块:Paths_primo 

I try to setup a stack based Haskell IDE with vscode and start with a small project created with stack init and then added a second module in src and added some dependencies in package.yaml. It builds ok but when I start stack ghci I have warnings:

Warning: Multiple files use the same module name:
         * Paths_primo found at the following paths
           * /home/frank/Workspace11/primo/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/autogen/Paths_primo.hs (primo:lib)
           * /home/frank/Workspace11/primo/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/primo-exe/autogen/Paths_primo.hs (primo:exe:primo-exe)
* * * * * * * *

GHCi, version 8.10.4: https://www.haskell.org/ghc/  :? for help
[1 of 3] Compiling Lib              ( /home/frank/Workspace11/primo/src/Lib.hs, interpreted )
[2 of 3] Compiling YamlRead         ( /home/frank/Workspace11/primo/src/YamlRead.hs, interpreted )
[3 of 3] Compiling Main             ( /home/frank/Workspace11/primo/app/Main.hs, interpreted )
Ok, three modules loaded.

There seems to be a confusion with autogen and with Paths_primo (primo is the name of the package). What am I doing wrong?

General question: what is the correct way to clean a stack project to "start over" after some experimentation? Is is correct to delete the cabal file and the stack-work directory. Waht is with stack.yaml and 'stack.yaml.lock`?

解决方案

This appears to be a harmless warning reported at Stack issue #5439, whose underlying cause is hpack issue #303. A workaround to get rid of the warning is disabling the generation of the Paths_ module for your primo-exe executable, by adding the following to its section in package.yaml:

when:
- condition: false
  other-modules: Paths_primo

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