[Haskell-cafe] [ANNOUNCE] GHC 9.8.1 is now available

J. Reinders jaro.reinders at gmail.com
Thu Oct 12 11:57:50 UTC 2023

Hi Kazu,

In addition to the other answers, I’d like to note that Data.List.unzip can be
much more efficient than Data.Functor.unzip. In particular, Data.List.unzip
only does a single traversal over the list and it can be fused with good
producers. Whereas Data.Functor.unzip does two traversals and cannot fuse.
The documentation should really be changed to mention that.

So, I’d say use Data.List.unzip when possible.



> On 12 Oct 2023, at 05:07, Kazu Yamamoto (山本和彦) via Haskell-Cafe <haskell-cafe at haskell.org> wrote:
> Hi,
> # The destination is only to haskell-cafe.
> Thank you for releasing GHC 9.8.1.
> I realized that "unzip" conflicts if Data.List and Data.Functor are
> imported.
> If this is intentional, please tell me which "unzip" we should use.
> --Kazu
>> The GHC developers are very pleased to announce the availability of the
>> final release of GHC 9.8.1. Binary distributions, source
>> distributions, and documentation are available at downloads.haskell.org:
>>    https://downloads.haskell.org/ghc/9.8.1
>> GHC 9.8 brings a number of new features and improvements, including:
>> * Preliminary support the `TypeAbstractions` language extension,
>>   allowing types to be bound in type declarations [TypeAbstractions].
>> * Support for the `ExtendedLiterals` extension, providing syntax for
>>   non-word-sized numeric literals in the surface language
>>   [extended-literals]
>> * Improved rewrite rule matching behavior, allowing limited matching of
>>   higher-order patterns
>> * Better support for user-defined warnings by way of the `WARNING`
>>   pragma [warnings]
>> * The introduction of the new `GHC.TypeError.Unsatisfiable`
>>   constraint, allowing more predictable user-defined type errors
>>   [unsatisfiable]
>> * Implementation of the export deprecation proposal, allowing module
>>   exports to be marked with `DEPRECATE` pragmas [deprecated-exports]
>> * The addition of build semaphore support for parallel compilation;
>>   with coming support in `cabal-install` this will allow better use of
>>   parallelism in multi-package builds [jsem]
>> * More efficient representation of info table provenance information,
>>   reducing binary sizes by over 50% in some cases when
>>   `-finfo-table-map` is in use
>> A full accounting of changes can be found in the [release notes][].
>> Plans for GHC's future releases can be found on the [GHC Wiki][status].
>> We would like to thank GitHub, IOG, the Zw3rk stake pool,
>> Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, the Haskell
>> Foundation, and other anonymous contributors whose on-going financial
>> and in-kind support has facilitated GHC maintenance and release
>> management over the years. Finally, this release would not have been
>> possible without the hundreds of open-source contributors whose work
>> comprise this release.
>> Happy compiling,
>> ~ Ben
>> [TypeAbstractions]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0425-decl-invis-binders.rst
>> [extended-literals]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0451-sized-literals.rst
>> [unsatisfiable]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0433-unsatisfiable.rst
>> [warnings]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0541-warning-pragmas-with-categories.rst
>> [deprecated-exports]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0134-deprecating-exports-proposal.rst
>> [jsem]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0540-jsem.rst
>> [release notes]: https://downloads.haskell.org/ghc/9.8.1/docs/users_guide/9.8.1-notes.html
>> [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status
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