GHC 9.10.1-alpha3 is now available

bgamari - 2024-04-15

The GHC developers are very pleased to announce the availability of the third alpha release of GHC 9.10.1. Binary distributions, source distributions, and documentation are available at

We hope to have this release available via ghcup shortly.

GHC 9.10 will bring a number of new features and improvements, including:

  • The introduction of the GHC2024 language edition, building upon GHC2021 with the addition of a number of widely-used extensions.

  • Partial implementation of the GHC Proposal #281, allowing visible quantification to be used in the types of terms.

  • Extension of LinearTypes to allow linear let and where bindings

  • The implementation of the exception backtrace proposal, allowing the annotation of exceptions with backtraces, as well as other user-defined context

  • Further improvements in the info table provenance mechanism, reducing code size to allow IPE information to be enabled more widely

  • Javascript FFI support in the WebAssembly backend

  • Improvements in the fragmentation characteristics of the low-latency non-moving garbage collector.

  • … and many more

A full accounting of changes can be found in the release notes. As always, GHC’s release status, including planned future releases, can be found on the GHC Wiki status.

This alpha is the penultimate prerelease leading to 9.10.1. In two weeks we plan to publish a release candidate, followed, if all things go well, by the final release a week later.

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