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 :

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-li... [3] https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0287-si... [4] https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0216-qu... [5] https://downloads.haskell.org/ghc/9.0.1-rc1/docs/html/users_guide/9.0.1-note... _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs