[Haskell-cafe] HLS in VS Code is identifying problems that don't when I run stack on the command line

[Dennis Raddle]

I'm opening the project by running VS Code first, then opening the root
folder of the project. I don't have a 'code' command installed or no path
to it set; this doesn't happen by default on MacOS but I could look it up.

But I think I got a better clue by running haskell-language-server-wrapper:

I got this line.
Run entered for
haskell-language-server-wrapper(haskell-language-server-wrapper) Version
1.9.0.0 x86_64 ghc-9.4.4

And then:

Tool versions found on the $PATH
cabal:          3.6.2.0
stack:          2.3.3
ghc:            8.10.7

My stack.yaml is using the resolver
lts-18.19
which does specify GHC 8.10.7 according to what I looked up.

But that ghc-9.4.4 seems to be a problem.

Thanks! But how to fix?



On Sat, Jan 7, 2023 at 5:13 AM Fendor <power.walross at gmail.com> wrote:

> How are you launching VSCode? Make sure you open the root of the project
> in VSCode.
> Opening VSCode from the cli via `code .` when you are in the correct
> directory is the most reliable.
>
> Further, on the cli, try running HLS like this:
> `haskell-language-server-wrapper --debug <some-path-to-a-source-file>` from
> the root of your project.
> Does this report the same error? If yes, more info about the project is
> needed like the .cabal file and the logs. Otherwise, it is a problem with
> the editor (e.g., PATH variable shenanigans).
>
> Best regards,
> Fendor
> On 07/01/2023 10:00, Dennis Raddle wrote:
>
> I'm trying to get HLS set up with a stack project on VS Code. I'm getting
> messages like this:
>
> Could not load module ‘Control.Monad.Except’
> It is a member of the hidden package ‘mtl-2.2.2’.
> You can run ‘:set -package mtl’ to expose it.
> (Note: this unloads all the modules in the current scope.)
>
> But these are in the "Problems" tab of VS Code (and show as red
> underlines).
>
> When I run stack clean, stack build I don't see any error like this at
> all.
>
> And yes, I made sure mtl was added everywhere in cac.cabal. (I'm using
> cac.cabal not stack.yaml... is that my problem?)
>
> I tried stack clean; stack build; restart HLS several times.
>
>
>
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