GHC 9.2.1-rc1 is now available

bgamari - 2021-08-07

The GHC team is very happy to announce the availability of the release cadidate of the 9.2.1 release. Binary distributions, source distributions, and documentation are available at

GHC 9.2 will bring a number of exciting features including:

  • A native code generation backend for AArch64, significantly reducing compilation times on ARM platforms such as the Apple M1.

  • 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 ghc-debug

  • Support for profiling of pinned objects with the cost-centre profiler (#7275)

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

Thank you to 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. Moreover, this release would not have been possible without the hundreds of open-source contributors whose work comprise this release.

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

Happy testing,

  • Ben