[ANNOUNCE] GHC 9.2.1-alpha2 released

Ben Gamari ben at well-typed.com
Fri Apr 23 03:58:44 UTC 2021

Hi all,

The GHC developers are very happy to announce the availability of the
second alpha release in the 9.2.1 series. Binary distributions, source
distributions, and documentation are available at


GHC 9.2 will bring a number of exciting features including:

 * Many changes in the area of records, including the new
   `RecordDotSyntax` and `NoFieldSelectors` language extensions, as well
   as Support for `DuplicateRecordFields` with `PatternSynonyms`.

 * Introduction of the new `GHC2021` language extension set, giving
   users convenient access to a larger set of language extensions which
   have been long considered stable.

 * Merge of `ghc-exactprint` into the GHC tree, providing infrastructure
   for source-to-source program rewriting out-of-the-box.

 * Introduction of a `BoxedRep` `RuntimeRep`, allowing for polymorphism
   over levity of boxed objects (#17526)

 * Implementation of the `UnliftedDataTypes` extension, allowing users
   to define types which do not admit lazy evaluation ([proposal])

 * The new [-hi profiling] mechanism which provides significantly
   improved insight into thunk leaks.

 * Support for the `ghc-debug` out-of-process heap inspection library

 * Support for profiling of pinned objects with the cost-centre profiler

 * Introduction of Haddock documentation support in TemplateHaskell (#5467)

 * Proper support for impredicative types in the form of Quick-Look

 * A native code generator backend for AArch64.

This pre-release brings nearly 50 fixes relative to the first alpha,
although the long-awaited ARM NCG backend hasn't quite landed yet.

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

Happy testing,

- Ben

[proposal]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0265-unlifted-datatypes.rst
[-hi profiling]: https://well-typed.com/blog/2021/01/first-look-at-hi-profiling-mode/
[ghc-debug]: http://ghc.gitlab.haskell.org/ghc-debug/
[ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
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