[ANNOUNCE] GHC 8.6.1 released

Herbert Valerio Riedel hvriedel at gmail.com
Sat Sep 22 08:30:13 UTC 2018

Hello everyone,

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 or later.

As such, GHC 8.6.1 works best with ‚Äč`cabal-install` or later;
please upgrade to `cabal-install` 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[8] (or
be able to access package releases on Hackage[9] 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[1] yet.

If you're on Ubuntu or Debian, you can get a compiled cabal-install 2.4
`.deb` package via Apt from

- https://launchpad.net/~hvr/+archive/ubuntu/ghc


- http://downloads.haskell.org/debian/


Binary versions for macOS and Windows are also expected to become
available via [2] and [3] soon (and also at [1]).

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[9] by invoking

    cabal install cabal-install-

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
    compiled using version of the Cabal library 

Finally, the Haskell Platform[4] 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"[5] in a uniform way across multiple
operating systems. See [4] and [5] for more details about the standard
Haskell Platform distribution.

 [1]: https://www.haskell.org/cabal/download.html
 [2]: https://haskell.futurice.com/
 [3]: https://hub.zhox.com/posts/chocolatey-introduction/
 [4]: https://www.haskell.org/platform/
 [5]: https://mail.haskell.org/pipermail/ghc-devs/2015-July/009379.html

 [6]: https://launchpad.net/~hvr/+archive/ubuntu/ghc
 [7]: http://downloads.haskell.org/debian/

 [8]: https://cabal.readthedocs.io/en/latest/file-format-changelog.html

 [9]: http://hackage.haskell.org/

-- Herbert

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
>     https://downloads.haskell.org/~ghc/8.6.1
> 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:
>     https://downloads.haskell.org/~ghc/8.6.1/docs/html/users_guide/8.6.1-notes.html
> 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:
>         https://www.haskell.org/ghc/
> We supply binary builds in the native package format for many
> platforms, and the source distribution is available from the same
> place.
> Packages will appear as they are built - if the package for your
> system isn't available yet, please try again later.
> Background
> ~~~~~~~~~~
> 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
> development.  The distribution includes space and time profiling
> facilities, a large collection of libraries, and support for various
> language extensions, including concurrency, exceptions, and foreign
> language interfaces. GHC is distributed under a BSD-style open source license.
> A wide variety of Haskell related resources (tutorials, libraries,
> specifications, documentation, compilers, interpreters, references,
> contact information, links to research groups) are available from the
> Haskell home page (see below).
> On-line GHC-related resources
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Relevant URLs on the World-Wide Web:
> GHC home page              https://www.haskell.org/ghc/
> GHC developers' home page  https://ghc.haskell.org/trac/ghc/
> Haskell home page          https://www.haskell.org/
> Supported Platforms
> ~~~~~~~~~~~~~~~~~~~
> The list of platforms we support, and the people responsible for them,
> is here:
>    https://ghc.haskell.org/trac/ghc/wiki/Contributors
> Ports to other platforms are possible with varying degrees of
> difficulty.  The Building Guide describes how to go about porting to a
> new platform:
>     https://ghc.haskell.org/trac/ghc/wiki/Building
> Developers
> ~~~~~~~~~~
> We welcome new contributors.  Instructions on accessing our source
> code repository, and getting started with hacking on GHC, are
> available from the GHC's developer's site run by Trac:
>   https://ghc.haskell.org/trac/ghc/
> Mailing lists
> ~~~~~~~~~~~~~
> We run mailing lists for GHC users and bug reports; to subscribe, use
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> Please report bugs using our bug tracking system.  Instructions on
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