I used the default stack new to setup a project that has a server and a client as separate executables. I altered the package.yaml file in what seems like the right way (As of April 21, 2020 "There...

when I type stack run I get no error message but when I type stack ghci I get this error about multiple files use the same name , how I can solve it ? (base) wejden@wejdenaydi:~/wejden$ stack ghci ...

How do I tell stack to build my executable and all its dependencies with -prof? Simply adding it to ghc-options in the .cabal file is not enough, because it only tries to build the executable wit...

Is there a way to make intellisense work for additional modules (anything outside the prelude) like Quicktest or Random in VS Code? I am using: VSCode: Version 1.55.0 the extension "Haskell v...

When I run stack ghci on a brand-new project, it fails to load: $ stack new repro simple Downloading template "simple" to create project "repro" in repro\ ... (Additional output omitted to make ...

I am trying to set an enverionment for Haskell and I installed stack. After the installation I realized the GHC 8.6.4 version is not the one that I need (8.0.2). compiler-exe: /home/manny/.stack/...

First, I created a new workspace: stack new xxxx stack init stack build then cd xxx\app stack ghci import Data.Map I can import other modules like Data.Char and Data.List, but I can't import ...

I need to import Graphics.UI.Gtk and GHC suggests: Perhaps you need to add ‘text’ to the build-depends in your .cabal file. but I use stack, so I add gtk to extra-deps, execute stack build and...

In my Haskell project when I stack run, it is showing the following, but still runs. What warning is this? How can I get rid of it? Stack has not been tested with GHC versions above 8.6, and using...

Is it possible to install a version of a package from github using Haskell stack? e.g. in a .cabal or a stack.yaml file, how can I point a dependency at a git repo/branch/revision?

I work with Haskell stack and found the --file-watch opton, but was then surprised that it works for build but not for run. Searching on the web indicates that there are some ways to achieve the ef...

I'm getting an error when attempting to compile Haskell tests using test-framework on Windows. Steps to reproduce Create a new library using Stack: $ stack new repro simple-library Then navigate i...

When I open some haskell project in VS Code I get this message: Couldn't figure out what GHC version the project is using: /home/andrej/.config/Code - OSS/User/globalStorage/haskell.haskell/haskell...

Stack (under Windows) sometimes throws the following exception when trying to download files (e.g., during stack setup or while downloading a build plan): TlsException (HandshakeFailed (Error_Prot...

I've written an application in Haskell and it's starting to become slightly useful to users. However my application isn't targeted at technically adept folks, let alone Haskell developers, so build...

I'm trying to install IHaskell in jupyter, directly from instructions here. I ran the following. sudo apt-get install -y python3-pip git libtinfo-dev libzmq3-dev libcairo2-dev libpango1.0-dev li...

I'd like to try out the Writer monad in ghci. As advised here, I tried to use only stack to manage GHC and packages, and avoid a global installation. From a fresh Ubuntu 15.04 install, after insta...

Using cabal, I could install hakyll with the command: cabal install hakyll How can I do the same thing using stack?

Stack fails with a 404 HTTP status to download a build plan for lts-14.1: $ stack new my-project [...] Downloading lts-14.1 build plan ... RedownloadInvalidResponse Request { host = "raw.github...

Is there a way to put {-# LANGUAGE <feature> #-} pragmas in either the: <project>.cabal, or stack.yaml file, to avoid repeating the same header code in every *.hs file of a project?...

I'm trying to compile the behead.hs script from the pandoc tutorial on Ubuntu 20.04 (WSL1). I can successfully compile it with stack exec -- ghc behead.hs or stack --resolver lts-16.25 exec -- ghc ...

I want to check if some package is installed globally by stack. How to do that?

I am attempting to build a project which uses Euterpea. Running stack build I get the following error, suggesting that I need to add Euterpea to the build-depends section of my .cabal file. $ sb ...

I want to setup an existing Haskell project with Stack. The existing project uses multiple files under a test directory; these separate test files by default, Stack (or cabal?) appears to utilize a...

I'd like some guidance on what's the (best) way to have Haskell work on Archlinux. By work I mean all, in terms of the ghci command line tool, installing packages I don't have - such as vector-spac...