The GHC team is happy to announce the availability of the first alpha
release in the GHC 8.10 series. Source and binary distributions are
available at the usual place
GHC 8.10.1 will bring a number of new features including:
newtypes around unlifted
StandaloneKindSignaturesextension allows users to give
top-level kind signatures to type, type family, and class
A new warning,
-Wderiving-defaults, to draw attention to ambiguous
A number of improvements in code generation, including changes
A new GHCi command, :instances, for listing the class instances
available for a type.
An upgraded Windows toolchain lifting the
A new, low-latency garbage collector.
Improved support profiling, including support for sending profiler
samples to the eventlog, allowing correlation between the profile and
other program events
This release is the second alpha of the 8.10 pre-release cycle. The
release will be a release candidate in roughly three weeks. If all goes
well the final release will be cut roughly two weeks after the
candidate, in mid-January.
This being an alpha release, there are a few issues that are still
The new Alpine Linux binary distribution is not present due to an
apparent correctness issue; any help Alpine users can offer here
would be greatly appreciated.
We have yet to sort out compliance with Apple’s notarization
requirements which will be likely be necessary for users of
However, until this has been sorted out Catalina users can exempt the
current macOS binary distribution from the notarization requirement
themselves by running
xattr -cr .on the unpacked tree before
There is one remaining non-regression correctness issue which we plan
to fix for the final 8.10.1 but that is not fixed in this release.
Please do test this release and let us know if you encounter any other