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

[Dennis Raddle]

Okay I think I solved this. By googling I found that there's a problem with
HLS and GHC 10.8.7, so upgrading my project to GHC 9.4.4 fixed it.


On Sat, Jan 7, 2023 at 3:53 PM Dennis Raddle <dennis.raddle at gmail.com>
wrote:

> Sorry it was a bit late when I wrote that last night so it was unclear.
>
> stack is using GHC  8.10.7 while Haskell Language Server seems to be using
> GHC 9.4.4. At various points while using VS Code I've gotten popups like
> "HLS is unable to determine GHC version" but later those stopped happening.
>
> Is this a problem that they are using different versions? Would this
> explain why HLS thinks mtl is hidden even though it's exposed in my cabal
> file?
>
> Mike
>
>
> On Sat, Jan 7, 2023 at 5:40 AM Dennis Raddle <dennis.raddle at gmail.com>
> wrote:
>
>> 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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>>
>>
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