I was hoping this might be fixed on hackage with a revision.

But looking at the Hackage Metadata Revisions FAQ it seems you can't change the Cabal spec version outside of very specific range.

And even if you could, the resolver probably isn't smart enough to conclude it can't build any version of happy-lib and then try instead to build an older version of happy, from before happy-lib was split off.

I'm cutting a release for happy-lib-2.0.2 anyway because of #309. Furthermore, I have now deprecated versions 2.0 and 2.0.1 of happy-lib. Does that help?

I now suspect it won't.
I'm not knowledgeable enough about cabal to be sure.

I could get cabal-3.2 to build happy by removing all happy-lib: prefixes from the happy-lib.cabal file.
And making sure it starts with cabal-version: 3.0, not 3.4.

Interesting. Can you try whether the just amended PR works?

You missed these two:

index 44381cb..209fac8 100644
--- a/lib/happy-lib.cabal
+++ b/lib/happy-lib.cabal
@@ -87,7 +87,7 @@ library frontend
                        Happy.Frontend.AbsSyn,
                        Happy.Frontend.Mangler,
                        Happy.Frontend.PrettyGrammar
-  build-depends:       base < 5, array, transformers, containers, mtl, happy-lib:grammar
+  build-depends:       base < 5, array, transformers, containers, mtl, grammar
   other-modules:
         Happy.Frontend.ParseMonad
         Happy.Frontend.ParseMonad.Class
@@ -107,7 +107,7 @@ library tabular
                        Happy.Tabular.Info,
                        Happy.Tabular.LALR,
                        Happy.Tabular.NameSet
-  build-depends:       base < 5, array, containers, happy-lib:grammar
+  build-depends:       base < 5, array, containers, grammar
 
 
 library backend-lalr

But if you remove them too, then it works.
The testsuite even passes.

Thanks! Will release 2.0.2 with the fix soon.

Hi.

Silly question: does this also work with Cabal 3.10.2.0 ? I'm asking because when trying to configure happy-lib it cannot find its libs:

$ runghc ../Setup.hs configure lib:happy-lib --package-db=clear --package-db=global --flags= 
Configuring library for happy-lib-2.0.2..
Error: Setup.hs: Encountered missing or private dependencies:
happy-lib:{backend-glr, backend-lalr, frontend, grammar, tabular}

\edit: never mind, I understand that this is to be expected when trying to configure a single component.