The GHC team is very pleased to announce the availability of GHC 9.0.1. Source and binary distributions are available at the usual place:
https://downloads.haskell.org/ghc/9.0.1/
In addition to numerous bug fixes, GHC 9.0.1 will bring a number of new
features:
* A first cut of the new LinearTypes language extension [2], allowing use
of linear function syntax and linear record fields.
* A new bignum library, ghc-bignum, improving portability and allowing GHC
to be more easily used with integer libraries other than GMP.
* Improvements in code generation, resulting in considerable
runtime performance improvements in some programs.
* Improvements in pattern-match checking, allowing more precise
detection of redundant cases and reduced compilation time.
* Implementation of the "simplified subsumption" proposal [3]
simplifying the type system and paving the way for QuickLook
impredicativity in GHC 9.2.
* Implementation of the QualifiedDo extension [4], allowing more
convenient overloading of `do` syntax.
* An experimental new IO manager implementation for Windows platforms, both
improving performance and fixing many of the quirks with the old manager
built
on POSIX-emulation.
* Improvements in compilation time.
And many more. See the release notes [5] for a full accounting of the
changes in this release.
As always, feel free to report any issues you encounter via
gitlab.haskell.org.
Cheers,
- Ben
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.0#ghc-prim-07
[2]:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0111-linear-types.rst
[3]:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0287-simplify-subsumption.rst
[4]:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0216-qualified-do.rst
[5]:
https://downloads.haskell.org/ghc/9.0.1/docs/html/users_guide/9.0.1-notes.html
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