Re: [ghc-steering-committee] GHC2023

We could have a look at the extensions that almost made the cut in 2021 and autonominate them. What I would like to nominate myself are: - SimplifiedSubsumption - ImpredicativeTypes Does anyone have any insight from the real world? Has GHC2021 helped

our users? And if not, why not?

I haven't had feedback come my way. I do fine GHC2021 quite liberating, honestly. On the other hand, there is one annoyance that I found but didn't have time to investigate: it seems that at least Stack, maybe Cabal, when starting a ghci process (e.g. for the language server) ends up having a ghci with GHC2021 turned on, even if the default language for the project is Haskell2010. This means that you get different error messages in your build and language server. Even if the programmer is unaware of GHC2021. But it probably shouldn't affect the current discussion. On Tue, Nov 1, 2022 at 3:05 PM Simon Peyton Jones < simon.peytonjones@gmail.com> wrote:

Adding Tom Ellis (thank you Jakob).

Simon

On Tue, 1 Nov 2022 at 11:43, Simon Peyton Jones < simon.peytonjones@gmail.com> wrote:

...

Another year has passed, and if we are serious with the idea that

...

GHC20xx is a continuous thing, we should probably start defining GHC2023 – even if it is just a small delta.

Indeed, we originally said we'd review GHC20xx annually, but I think we might want to consult the community to see if that is too often. There has been an interesting thread https://discourse.haskell.org/t/quo-vadis-ghc2023/5220on the Haskell Discourse.

The HF Stability Working Group discussed this on Monday, and I think Tom Ellis (a member of the SWG) is willing to lead a consultation. I think that would be great -- we have no axe to grind here, and I think we'll be delighted to do whatever makes the maximal number of people happy.

Tom (cc'd) will write with more info shortly. Sound OK?

Simon

On Mon, 24 Oct 2022 at 20:49, Joachim Breitner wrote:

...

Hi Committee,

when we defined the process for GHC20xx, as written in

https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0372-gh... we wrote

Likely, the first iteration of this process will be vastly different from the following ones: The first one is expected to add a large number of uncontroversial extensions; so the next iteration will likely only make a smaller, but more controversial change.

Therefore, this proposal does not commit to a fixed cadence. Instead, 6 months after the first release of a version of GHC that supports a GHC20xx set, we evaluate the outcome, the process, and the perceived need of a next release. At that time we will refine the processes, if needed, and set a cadence.

The first version of GHC that supported GHC2021 was 9.2, released in October 2022.

Last fall we said that not enough time has passed to do such an evaluation, and we skipped defining GHC2022.

Another year has passed, and if we are serious with the idea that GHC20xx is a continuous thing, we should probably start defining GHC2023 – even if it is just a small delta. This e-mail tries to kickstart that process.

Last time we did a relative elaborate thing where we voted on essentially _every_ extension. I think that made sense for the first iteration, where we had to winddow down the likely extensions. But now we have a base line (GHC2021), and are asked to find a suitable delta, and I’d go for a nomination-based approach: Committee members can propose adding (or removing, in theory) specific extensions, and then we vote only on those. Does that sound reasonable?

Does anyone have any insight from the real world? Has GHC2021 helped our users? And if not, why not?

What kind of hard data would you like to see, if any?

(I’m a bit wary of spending too much time writing scripts to scrape hackage, for example to see which extensions people tend to enable _in addition_ to GHC2021, only to see that libraries on hackage are understandably slow to use default-language: GHC2021, as that’s not great for backward compat for now. But I am also not sure where to look for good data…)

Cheers, Joachim

-- Joachim Breitner mail@joachim-breitner.de http://www.joachim-breitner.de/

_______________________________________________ ghc-steering-committee mailing list ghc-steering-committee@haskell.org https://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-steering-committee

_______________________________________________ ghc-steering-committee mailing list ghc-steering-committee@haskell.org https://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-steering-committee