Thanks a lot, devs! A bug in the docs, it seems: https://downloads.haskell.org/ghc/9.4.1-alpha1/docs/html/ references User Guide as https://downloads.haskell.org/ghc/9.4.1-alpha1/docs/html/users_guide/index.h... but this url gives 404. Same with the GHC API link. -- Best, Artem On Sun, May 1, 2022, 7:18 PM Ben Gamari <ben@well-typed.com> wrote:
The GHC developers are happy to announce the availability of the first alpha release of the GHC 9.4 series. Binary distributions, source distributions, and documentation are available at downloads.haskell.org:
https://downloads.haskell.org/ghc/9.4.1-alpha1
This major release will include:
- A new profiling mode, `-fprof-late`, which adds automatic cost-center annotations to all top-level functions *after* Core optimisation has run. This incurs significantly less performance cost while still providing informative profiles.
- A variety of plugin improvements including the introduction of a new plugin type, *defaulting plugins*, and the ability for typechecking plugins to rewrite type-families.
- An improved constructed product result analysis, allowing unboxing of nested structures, and a new boxity analysis, leading to less reboxing.
- Introduction of a tag-check elision optimisation, bringing significant performance improvements in strict programs.
- Generalisation of a variety of primitive types to be levity polymorphic. Consequently, the `ArrayArray#` type can at long last be retired, replaced by standard `Array#`.
- Introduction of the `\cases` syntax from [GHC proposal 0302]
- A complete overhaul of GHC's Windows support. This includes a migration to a fully Clang-based C toolchain, a deep refactoring of the linker, and many fixes in WinIO.
- Support for multiple home packages, significantly improving support in IDEs and other tools for multi-package projects.
- A refactoring of GHC's error message infrastructure, allowing GHC to provide diagnostic information to downstream consumers as structured data, greatly easing IDE support.
- Significant compile-time improvements to runtime and memory consumption.
- ... and much more
We would like to thank Microsoft Azure, GitHub, IOHK, the Zw3rk stake pool, Tweag I/O, Serokell, Equinix, SimSpace, 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.
As always, do give this release a try and open a [ticket] if you see anything amiss.
Happy testing,
- Ben
[GHC proposal 0302]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0302-ca... [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs