Re: Install with cabal fails with ghc 9.0.1, ghc 8.10.5 OK

["krulis....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <krulis.tomas.tk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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The issue was with pandoc-crossref.
Apparently, it doesnt suppor ghc 9.0 yet, per this 
issue: https://github.com/lierdakil/pandoc-crossref/issues/312

I am very sorry for reporting it here, I am used to install both programs 
together, since they are closely tied up, and only after guidance from 
cabal team I connected the dots.

Dne středa 16. června 2021 v 7:47:03 UTC+2 uživatel krulis....@gmail.com 
napsal:

> I am using cabal v. 3.4.0.0.
>
> I have tested commands you provided.
>
> ```
> cabal clean
> cabal update
> ```
>
> runs through OK, `cabal build` asks me for `cabal.project` file. I might 
> have written misleading information -- I was using command:
>
> ```
> cabal install pandoc pandoc-crossref
> ```
>
> I was not compiling repo clone directly from source (thats how I would get 
> the `cabal.project` file, correct?)
> This `cabal install` command runs through with ghc 8.10.5, but fails with 
> ghc 9.0.1. The reported error seems very strange to me, because if I 
> understand correctly, cabal is for some reason trying to use very old 
> version of `data-accessor` package ... ?
> Let me know if I should move my question elsewhere (reddit, SO, cabal 
> issues), this seems mostly like some hidden hickup in my setup ...
>
> Addendum: Haskell setup
>
> I am using `ghcup` to get haskell running. I have moved on it recently. 
> Before then, I was using Manjaro stable repo to get pandoc and 
> pandoc-crossref, but that becomes clunky when I want to make new projects 
> with cabal (at least to me).
>
> 1. I removed pandoc, pandoc-crossref, ghc, ghc-static and cabal-install 
> from my packages
> 2. I removed orphaned packages, mostly haskell libraries installed by 
> Manjaro. I have no idea whether I have still some installed. If that might 
> be the cause, please let me know. As system package, I was having installed 
> ghc 8.10.5, but searching packages with pacman gives me no haskell-* 
> packages, as they are named in Manjaro/Arch
> 3. I installed ghcup from here: https://www.haskell.org/ghcup/
> 4. I installed cabal (and stack) with ghcup
> 5. I installed pandoc and pandoc-crossref, all went OK, because ghcup 
> seems to use ghc 8.10.5 as default for new installation
> 6. I noticed warning message from ghcup, that there is newer ghc version. 
> I installed it with ghcup and set it as my new default
> 7. I deleteted `$HOME/.ghc` and `$HOME/.cabal` folders, since reportedly 
> they cause issues after upgrading ghc or cabal
> 8. I ran `cabal update`
> 9. I repeated `cabal install pandoc pandoc-crossref` (with active ghc v. 
> 9.0.1) but it throws error I posted in the beginning.
> Dne středa 16. června 2021 v 0:17:13 UTC+2 uživatel John MacFarlane napsal:
>
>>
>> We do CI with ghc 9.0.1, so the builds are confirmed to work. 
>> Try 
>>
>> cabal clean 
>> cabal update 
>> cabal build 
>>
>> Are you using up-to-date cabal? 
>>
>> "krulis....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <krulis....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes: 
>>
>> > As Manjaro (Arch derivative) user learning Haskell I am a little 
>> struggling 
>> > to set up functional environment for working with Haskell. Currently, I 
>> > have landed on using `ghcup` + `cabal` to manage everything haskell 
>> > related. I have good experience with `rustup` + `cargo`, so I hope my 
>> > experience with `ghcup` will be also "UP." 
>> > 
>> > With that, I am landing on compiling pandoc from source, not 
>> downloading 
>> > binary package. Compilation with ghc v. 8.10.5 works as expected, but 
>> with 
>> > ghc 9.0.1 (latest I believe) it fails with this output: 
>> > 
>> > ``` 
>> > Resolving dependencies... 
>> > cabal: Could not resolve dependencies: 
>> > [__0] trying: pandoc-2.14.0.2 (user goal) 
>> > [__1] trying: unicode-collation-0.1.3 (dependency of pandoc) 
>> > [__2] trying: template-haskell-2.17.0.0/installed-2.17.0.0 (dependency 
>> of 
>> > unicode-collation) 
>> > [__3] trying: skylighting-core-0.10.5.1 (dependency of pandoc) 
>> > [__4] trying: transformers-0.5.6.2/installed-0.5.6.2 (dependency of 
>> > skylighting-core) 
>> > [__5] trying: containers-0.6.4.1/installed-0.6.4.1 (dependency of 
>> pandoc) 
>> > [__6] trying: base-4.15.0.0/installed-4.15.0.0 (dependency of pandoc) 
>> > [__7] trying: pandoc-crossref-0.3.11.0 (user goal) 
>> > [__8] next goal: data-accessor-template (dependency of pandoc-crossref) 
>> > [__8] rejecting: data-accessor-template-0.2.1.16 (conflict: 
>> > template-haskell==2.17.0.0/installed-2.17.0.0, data-accessor-template 
>> => 
>> > template-haskell>=2.11 && <2.17) 
>> > [__8] skipping: data-accessor-template-0.2.1.15, 
>> > data-accessor-template-0.2.1.14, data-accessor-template-0.2.1.13, 
>> > data-accessor-template-0.2.1.12, data-accessor-template-0.2.1.11, 
>> > data-accessor-template-0.2.1.10, data-accessor-template-0.2.1.9, 
>> > data-accessor-template-0.2.1.8, data-accessor-template-0.2.1.7, 
>> > data-accessor-template-0.2.1.6, data-accessor-template-0.2.1.5, 
>> > data-accessor-template-0.2.1.4, data-accessor-template-0.2.1.3, 
>> > data-accessor-template-0.2.1.2, data-accessor-template-0.2.1.1, 
>> > data-accessor-template-0.2.1, data-accessor-template-0.2, 
>> > data-accessor-template-0.1.4, data-accessor-template-0.1.3, 
>> > data-accessor-template-0.1.2, data-accessor-template-0.1.1 (has the 
>> same 
>> > characteristics that caused the previous version to fail: excludes 
>> > 'template-haskell' version 2.17.0.0) 
>> > [__8] fail (backjumping, conflict set: data-accessor-template, 
>> > pandoc-crossref, template-haskell) 
>> > After searching the rest of the dependency tree exhaustively, these 
>> were the 
>> > goals I've had most trouble fulfilling: pandoc, yaml, pandoc-crossref, 
>> base, 
>> > template-haskell, data-accessor-template, transformers, 
>> skylighting-core, 
>> > containers, unicode-collation 
>> > Try running with --minimize-conflict-set to improve the error message. 
>> > ``` 
>> > 
>> > Is it known state of things, or is it some error on my side? 
>> > Thanks in advance for any guidance in this, regards 
>> > Tomas 
>> > 
>> > -- 
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>>
>>
>

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