[ANNOUNCE] GHC 8.6.1 released
Herbert Valerio Riedel
hvriedel at gmail.com
Sat Sep 22 08:30:13 UTC 2018
Here's an addendum to the announcment as it ommitted an important detail:
GHC 8.6.1 is only guaranteed to work properly with tooling which uses
lib:Cabal version 22.214.171.124 or later.
As such, GHC 8.6.1 works best with `cabal-install` 126.96.36.199 or later;
please upgrade to `cabal-install` 188.8.131.52 if you haven't already.
Note that cabal-install 2.4 supports all GHC versions back till GHC
7.0.4 and we also strongly recommend to use the latest available stable
release of `cabal` even with older GHC releases as bugfixes and
improvements aren't always backported to older Cabal releases as well as
to be able to benefit from recently added CABAL format features (or
be able to access package releases on Hackage which rely on those
features) which require recent enough versions of Cabal as well.
Note that binaries aren't available on cabal's download page yet.
If you're on Ubuntu or Debian, you can get a compiled cabal-install 2.4
`.deb` package via Apt from
Binary versions for macOS and Windows are also expected to become
available via  and  soon (and also at ).
In the meantime, if you already have GHC 7.10 or later (together with a
compatible `cabal` executable) installed, you can easily install cabal
2.4 yourself from Hackage by invoking
cabal install cabal-install-184.108.40.206
and making sure that the resulting `cabal` executable is accessible via
your $PATH; you can check with `cabal --version` which should emit
something along the lines of
$ cabal --version
cabal-install version 220.127.116.11
compiled using version 18.104.22.168 of the Cabal library
Finally, the Haskell Platform release for GHC 8.6.1 should be
available soon as well which provides yet another recommended "standard
way to get GHC and related tools" in a uniform way across multiple
operating systems. See  and  for more details about the standard
Haskell Platform distribution.
On 2018-09-21 at 20:57:02 -0400, Ben Gamari wrote:
> Hello everyone,
> The GHC team is pleased to announce the availability of GHC 8.6.1, the
> fourth major release in the GHC 8 series. The source distribution, binary
> distributions, and documentation for this release are available at
> The 8.6 release fixes over 400 bugs from the 8.4 series and introduces a
> number of exciting features. These most notably include:
> * A new deriving mechanism, `deriving via`, providing a convenient way
> for users to extend Haskell's typeclass deriving mechanism
> * Quantified constraints, allowing forall quantification in constraint contexts
> * An early version of the GHCi `:doc` command
> * The `ghc-heap-view` package, allowing introspection into the
> structure of GHC's heap
> * Valid hole fit hints, helping the user to find terms to fill typed
> holes in their programs
> * The BlockArguments extension, allowing the `$` operator to be omitted
> in some unambiguous contexts
> * An exciting new plugin mechanism, source plugins, allowing plugins to
> inspect and modify a wide variety of compiler representations.
> * Improved recompilation checking when plugins are used
> * Significantly better handling of macOS linker command size limits,
> avoiding linker errors while linking large projects
> * The next phase of the MonadFail proposal, enabling
> -XMonadFailDesugaring by default
> A full list of the changes in this release can be found in the
> release notes:
> Perhaps of equal importance, GHC 8.6 is the second major release made
> under GHC's accelerated six-month release schedule and the first set of
> binary distributions built primarily using our new continuous
> integration scheme. While the final 8.6 release is around three weeks
> later than initially scheduled due to late-breaking bug reports, we
> expect that the 8.8 release schedule shouldn't be affected.
> Thanks to everyone who has contributed to developing, documenting, and
> testing this release!
> As always, let us know if you encounter trouble.
> How to get it
> The easy way is to go to the web page, which should be self-explanatory:
> We supply binary builds in the native package format for many
> platforms, and the source distribution is available from the same
> Packages will appear as they are built - if the package for your
> system isn't available yet, please try again later.
> Haskell is a standard lazy functional programming language.
> GHC is a state-of-the-art programming suite for Haskell. Included is
> an optimising compiler generating efficient code for a variety of
> platforms, together with an interactive system for convenient, quick
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