Release checklist for GHC 9.6

[bgamari]

Describe the bug
Here we will track the status of the Cabal release which will ship will GHC 9.6.

[Mikolaj]

A couple of things for the list:

• collect any new GHC extensions we'd need to add to Cabal; set a date when the list is finalized so that we can implement it
• add 9.6 to the list of known GHC versions; for this to be serious, CI should run with 9.6; it recently started running with 9.4 but some work remains (update of changelog.d, now maintained by @fgaz , and some doctest woes with 9.4)

[coot]

@bgamari @Kleidukos this doesn't fit here (as it's not just cabal); for the cabal haddock-project command, we also need haddock-2.26.1 to be released.

[Mikolaj]

Ben says no more extensions are needed this time. This tests it and currently passes: https://gitlab.haskell.org/ghc/ghc/-/blob/master/testsuite/tests/driver/T4437.hs

[Mikolaj]

now that GHC 9.6.1-alpha1 is out, it would be great to add it to CI but, alas, this requires some extra work (at least a switch to ghcup in CI): #8675

[Mikolaj]

The 3.10 branch is cut: https://github.com/haskell/cabal/tree/first-cut-of-3.10

With a lot of luck, the Cabal-syntax and Cabal packages contained therein will be included in the official 3.10 release unchanged, except for the version numbers, copyrights and similar release busywork.

A binary for dogfooding:

ghcup --no-cache install cabal -u 'https://gitlab.haskell.org/haskell/cabal/-/jobs/1317949/artifacts/raw/out/cabal-install-3.9-x86_64-linux-alpine.tar.xz' first-cut-of-3.10

[jneira]

congrats to all cabal maintainers and contributors, great work!
The equivakent for windows would be ghcup --no-cache install cabal -u https://gitlab.haskell.org/haskell/cabal/-/jobs/1317954/artifacts/raw/out/cabal-install-3.9-x86_64-windows.zip first-cut-of-3.10?

EDIT: it worked for me, i guess it is correct cause is from last pipeline

[Bodigrim]

The equivalent for macOS M2 is ghcup --no-cache install cabal -u 'https://gitlab.haskell.org/haskell/cabal/-/jobs/1317953/artifacts/raw/out/cabal-install-3.9-aarch64-darwin.tar.xz' first-cut-of-3.10.

The new Cabal warns me on every new dependency that

Warning: Error verifying fetched tarball
/Users/andrew/.cabal/packages/hackage.haskell.org/active/0.2.0.16/active-0.2.0.16.tar.gz,
will redownload:
/Users/andrew/.cabal/packages/hackage.haskell.org/01-index.tar: withFile: does
not exist (No such file or directory)

How can I disable this noise? I don't understand the warning: /Users/andrew/.cabal/packages/hackage.haskell.org/01-index.tar is certainly there.

[jneira]

i also have seen those warnings building cabal itself:

D:\cabal\packages\hackage.haskell.org\data-array-byte\0.1.0.1\data-array-byte-0.1.0.1.tar.gz,
will redownload: D:\cabal\packages\hackage.haskell.org\01-index.tar: withFile:
does not exist (El sistema no puede encontrar la ruta especificada.)
Warning: Error verifying fetched tarball
D:\cabal\packages\hackage.haskell.org\hashable\1.4.2.0\hashable-1.4.2.0.tar.gz,
will redownload: D:\cabal\packages\hackage.haskell.org\01-index.tar: withFile:
does not exist (El sistema no puede encontrar la ruta especificada.)
Warning: Error verifying fetched tarball
D:\cabal\packages\hackage.haskell.org\haskell-lexer\1.1.1\haskell-lexer-1.1.1.tar.gz,
will redownload: D:\cabal\packages\hackage.haskell.org\01-index.tar: withFile:
does not exist (El sistema no puede encontrar la ruta especificada.)
Warning: Error verifying fetched tarball
D:\cabal\packages\hackage.haskell.org\microstache\1.0.2.3\microstache-1.0.2.3.tar.gz,
will redownload: D:\cabal\packages\hackage.haskell.org\01-index.tar: withFile:
does not exist (El sistema no puede encontrar la ruta especificada.)
Warning: Error verifying fetched tarball
D:\cabal\packages\hackage.haskell.org\network-uri\2.6.4.2\network-uri-2.6.4.2.tar.gz,
will redownload: D:\cabal\packages\hackage.haskell.org\01-index.tar: withFile:
does not exist (El sistema no puede encontrar la ruta especificada.)
Warning: Error verifying fetched tarball
D:\cabal\packages\hackage.haskell.org\parsec\3.1.16.1\parsec-3.1.16.1.tar.gz,
will redownload: D:\cabal\packages\hackage.haskell.org\01-index.tar: withFile:
does not exist (El sistema no puede encontrar la ruta especificada.)
Warning: Error verifying fetched tarball
D:\cabal\packages\hackage.haskell.org\tasty\1.4.3\tasty-1.4.3.tar.gz, will
redownload: D:\cabal\packages\hackage.haskell.org\01-index.tar: withFile: does
not exist (El sistema no puede encontrar la ruta especificada.)

[Mikolaj]

That's strange. I'm not getting these warnings. Maybe something changed in the hackage-security packages or similar. Could you please file an issue? Does it persist after cabal update? After cabal clean? After moving away ~.cabal?

[Bodigrim]

@Mikolaj isn't it #8500? It persists for any new downloads after cabal update or cabal clean. Try to build a package you have not built before, or purge ~/.cabal/packages to force re-downloading.

[Mikolaj]

You are right, I'm getting it now.