haskell-language-server VS lsp-haskell

The advent of language server protocol made possible the creation of HLS (Haskell Language Server), and there are plugins for many editors, such as vscode-haskell, that allow you to have auto-complete, auto-import, and automatic function signatures—also available to your editor of choice. The whole feedback loop of editing, compiling, and running is greatly improved.

The Haskell community has been focusing on tooling and IDE support in the last several years. Haskell-Language-Server is a huge improvment, so the experience is probably much better than you remember, but it'll still be a while before it catches up with Rust.

static-ls is a low memory language server for Haskell that serves as an alternative to (hls)[https://github.com/haskell/haskell-language-server] with less functionality by using statically generated information. It is intended for (Highly recommend hls instead if you aren't having these issues):

Indeed, there is a lot of room for improvements. But I just wanted to acknowledge and thank the work of those involved in HLS which IMHO was a game changer in that regard.

Specifically, gchup and HLS are both opensource community efforts. If you want to see HLS work with ghc-9.2.5, you may want to ask https://github.com/haskell/haskell-language-server or, better, provide them a PR that builds HLS with ghc-9.2.5.

Sadly ghcup tui is not available on windows, but you can check the available versions with ghcup list. Hls lists the compatible versions of ghc at their github releases. For 1.8.0.0 I went with 9.4.2. To install it and set it to default you have to use the ghcup install ghc 9.4.2 then the ghcup set ghc 9.4.2. Hopefully this will be useful to someone with the same problem.

Here's an issue I created for it: https://github.com/haskell/haskell-language-server/issues/3348

The code is executed by HLS, see https://github.com/haskell/haskell-language-server/blob/master/plugins/hls-eval-plugin/README.md and then its markdown/html output is displayed by VS Code.

Were you using emacs-lsp?

If you're interested in complete setups, my haskell-mode configuration is here, general lsp-mode (I also have an eglot setup, but that's just local for now) is here and Haskell-specific lsp-mode settings (fixing, among other things, stuff like this issue) are here.

I think this is a problem with haskell language server. Also, there seems to be something missing in lsp-haskell indicated by the null errors but most likely it is not related to code actions. It is best to open an issue in https://github.com/emacs-lsp/lsp-haskell .