[ANNOUNCE] GHC 9.6.2 is now available

Ben Gamari ben at well-typed.com
Tue May 23 21:31:19 UTC 2023

The GHC developers are happy to announce the availability of GHC 9.6.2. Binary
distributions, source distributions, and documentation are available at


This release is primarily a bug-fix release addressing a few issues
found in 9.6.2. These include:

 * a number of simplifier and specialisation issues (#22761, #22549)

 * A bug resulting in crashes of programs using the new ``listThreads#`` primop

 * A compiler crash triggered by certain uses of quantified constraints

 * Various bugs in the Javascript backend have been fixed (#23399,
   #23360, #23346)

 * A missing write barrier in the non-moving collector's handling of selector
   thunks, resulting in undefined behavior (#22930).

 * The non-moving garbage collector's treatment of weak pointers has been
   revamped which should allow more reliable finalization of ``Weak#``
   closures (#22327)

 * The non-moving garbage collector now bounds the amount of marking it will
   do during the post-marking stop-the-world phase, greatly reducing tail
   latencies in some programs (#22929)

A full accounting of changes can be found in the [release notes]. As
some of the fixed issues do affect correctness users are encouraged to
upgrade promptly.

We would like to thank Microsoft Azure, GitHub, IOG, the Zw3rk stake pool,
Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, 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.

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

Happy compiling,

~ Ben

[ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
[release notes]: https://downloads.haskell.org/~ghc/9.6.2/docs/users_guide/9.6.2-notes.html
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