GHC 9.14.1-rc2 is now available

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Subject: GHC 9.14.1-rc2 is now available
MIME-Version: 1.0

The GHC developers are very pleased to announce the availability of the
second release candidate of GHC 9.14.1. Binary distributions, source
distributions, and documentation are available at [downloads.haskell.org][].

The changes from the first release candidate are:

* Bump the exceptions submodule to 0.10.11
* Bump the os-string submodule to 2.0.8
* Fix a driver regression causing an infinite loop with cyclic imports

GHC 9.14 will bring a number of new features and improvements, including:

* Significant improvements in specialisation:
    * The `SPECIALISE` pragma now allows use of type application syntax
    * The `SPECIALISE` pragma can be used to specialise for expression argu=
ments
      as well as type arguments.
    * Specialisation is now considerably more reliable in the presence of
      `newtype`s

* Significant GHCi improvements including:
   * Correctness and performance improvements in the bytecode interpreter
   * Features in the GHCi debugger
   * Support for multiple home units in GHCi

* Implementation of the [Explicit Level Imports proposal][levels]

* `RequiredTypeArguments` can now be used in more contexts

* SSE/AVX2 support in the x86 native code generator backend=20

* A major update of the Windows toolchain and improved compatibility with
   macOS Tahoe

* ... and many more

A full accounting of changes can be found in the [release notes][]. Given t=
he
many specialisation improvements and their potential for regression, we wou=
ld
very much appreciate testing and performance characterisation on downstream
workloads.

Note that while this release makes many improvements in the specialisation
optimisation, polymorphic specialisation will remain disabled by default in=
 the
final release due to concern over regressions of the sort identified in
[#26329][T26329]. Users needing more aggressive specialisation can explicit=
ly
enable this feature with the `-fpolymorphic-specialisation` flag. Depending
upon our experience with 9.14.1, we may enable this feature by default in a
later minor release.

We would like to thank the Zw3rk stake pool, Well-Typed, Mercury, Channable,
Tweag I/O, Serokell, SimSpace, the Haskell Foundation, and other anonymous
contributors whose on-going financial and in-kind support has facilitated G=
HC
maintenance and release management over the years. Finally, this release wo=
uld
not have been possible without the hundreds of open-source contributors who=
se
work have made the Haskell ecosystem what it is today.

As always, do give this release a try and open a [ticket][] if you see
anything amiss.


[downloads.haskell.org]: https://downloads.haskell.org/ghc/9.14.1-rc2
[release notes]: https://downloads.haskell.org/ghc/9.14.1-rc2/docs/users_gu=
ide/9.14.1-notes.html
[ticket]: https://gitlab.haskell.org/ghc/homepage/-/issues/new
[macos]: https://gitlab.haskell.org/ghc/ghc/-/issues/26166
[T26329]: https://gitlab.haskell.org/ghc/ghc/-/issues/26329
[levels]: https://github.com/ghc-proposals/ghc-proposals/blob/master/propos=
als/0682-explicit-level-imports.rst

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