dhall-1.42.0 fails to build in Stackage Nightly

[juhp]

       Building library for dhall-1.42.0..
       [69 of 77] Compiling Dhall.TH
       
       /var/stackage/work/unpack-dir/unpacked/dhall-1.42.0-d29671176e59c6861b5d2ff055de0a8160793e10de281c46a8279821c9efc88d/src/Dhall/TH.hs:274:38: error:
           • Couldn't match type: flag0 -> Syntax.TyVarBndr flag0
                            with: Syntax.TyVarBndr ()
             Expected: [Syntax.TyVarBndr ()]
               Actual: [flag0 -> Syntax.TyVarBndr flag0]
           • In the third argument of ‘DataD’, namely ‘params’
             In the expression:
               DataD [] name params Nothing constructors derivingClauses
             In the first argument of ‘pure’, namely
               ‘[DataD [] name params Nothing constructors derivingClauses]’
           |
       274 |                 [pure [DataD [] name params Nothing constructors derivingClauses]] <>
           |                                      ^^^^^^

[sjakobi]

I can reproduce this with GHC 9.0.1, 9.0.2, 9.2.4 and 9.4.4, and have made a corresponding revision on Hackage: https://hackage.haskell.org/package/dhall-1.42.0/revisions/

The issue was apparently introduced in #2506 or an earlier change to that file (CC @ndwarshuis).

I don't understand why CI didn't catch this issue though – I thought the ubuntu-latest and windows-latest jobs are using GHC 9.0.1.

[sjakobi]

I don't understand why CI didn't catch this issue though – I thought the ubuntu-latest and windows-latest jobs are using GHC 9.0.1.

These jobs don't make use of the installed "Haskell environment" though – they use stack with lts-18.18 which is based on GHC-8.10.7.

I guess it's high time to add CI with a recent version of GHC.

[alaendle]

@sjakobi - to enable dhall-1.42.0 in nightly we also need relaxed bounds for template-haskell and unix-compat.

template-haskell-2.19.0.0 (changelog) is out of bounds for:

• dhall-1.42.0 (>=2.13.0.0 && < 2.17). Gabriella Gonzalez [email protected] @Gabriella439. Used by: library

unix-compat-0.7 (changelog) (Mitchell Rosen [email protected] @mitchellwrosen) is out of bounds for:

• dhall-1.42.0 (>=0.4.2 && < 0.7). Gabriella Gonzalez [email protected] @Gabriella439. Used by: library

[ocharles]

I think it's more than relaxing bounds for unix-compat - dhall-1.42 doesn't build with unix-compat-0.7.

[chenrui333]

any update on this thread?

[ysangkok]

It was fixed in #2542

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[Gabriella439]

Yeah, I'm closing this as I'm fairly confident this is fixed in master and will be fixed in the next release of dhall. (I've been meaning to release it soon, but have just been very busy, but I hope to get to cutting the release this Sunday)