[ANNOUNCE] Glasgow Haskell Compiler 9.0.1-rc1 released

[Alex Biehl]

Ben,

Thank you for your effort. It is greatly appreciated.

One nit though: I noticed the Haddocks for ghc and the libraries don't come
with hyperlinked source but instead with the old, deprecated HsColour
sources.
Grepping on GitLab showed some commits around switching
--hyperlinked-sources on unfortinately it doesn't



Am Mi., 30. Dez. 2020 um 16:17 Uhr schrieb Ben Gamari <ben at well-typed.com>:

>
> Hello all,
>
> The GHC team is very pleased to announce the availability of the first
> release candidate of GHC 9.0.1 series. Source and binary distributions are
> available at the usual place:
>
>     https://downloads.haskell.org/ghc/9.0.1-rc1/
>
> This release candidate comes quite a bit later than expected after
> difficulty finding a performance neutral fix for a critical soundness bug,
> #17760. See [1] for details on the solution, particularly
> if you are a library maintainer currently using the touch# primop or
> withForeignPtr.
>
> Nevertheless, this release has nevertheless seen a considerable amount of
> testing and consequently we hope that this should be the last
> pre-release before the final release.
>
> In addition to numerous bug fixes, GHC 9.0.1 will bring a number of new
> features:
>
>  * A first cut of the new LinearTypes language extension [2], allowing
>    use of linear function syntax and linear record fields.
>
>  * A new bignum library (ghc-bignum), allowing GHC to be more easily
>    used with integer libraries other than GMP.
>
>  * Improvements in code generation, resulting in considerable
>    performance improvements in some programs.
>
>  * Improvements in pattern-match checking, allowing more precise
>    detection of redundant cases and reduced compilation time.
>
>  * Implementation of the "simplified subsumption" proposal [3]
>    simplifying the type system and paving the way for QuickLook
>    impredicativity in GHC 9.2.
>
>  * Implementation of the QualifiedDo extension [4], allowing more
>    convenient overloading of `do` syntax.
>
>  * Improvements in compilation time.
>
> And many more. See the release notes [5] for a full accounting of the
> changes in this release.
>
> As always, do test this release and open tickets for whatever issues you
> encounter.
>
> Cheers,
>
> - Ben
>
> [1] https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.0#ghc-prim-07
> [2]
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0111-linear-types.rst
> [3]
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0287-simplify-subsumption.rst
> [4]
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0216-qualified-do.rst
> [5]
> https://downloads.haskell.org/ghc/9.0.1-rc1/docs/html/users_guide/9.0.1-notes.html
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>
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