So this preview has been available for more than 5 years.
Andrei did a keynote on it, and that seemed generally well received (if not
a little tepid, because not so many people care about this).
All the code I've written in the last 5 years doesn't work without this.
I have exercised this pretty extensively in whatever flavour of code it is
that I tend to write, and never had any problem. It works like it's meant
to.
I would severely struggle to return to a D without it.

Can we un-preview this now?

On Tuesday, 13 August 2024 at 04:23:15 UTC, Manu wrote:
> So this preview has been available for more than 5 years.
> Andrei did a keynote on it, and that seemed generally well received (if not
> a little tepid, because not so many people care about this).
> All the code I've written in the last 5 years doesn't work without this.
> I have exercised this pretty extensively in whatever flavour of code it is
> that I tend to write, and never had any problem. It works like it's meant
> to.
> I would severely struggle to return to a D without it.
>
> Can we un-preview this now?

yes, please!

On Tuesday, 13 August 2024 at 04:23:15 UTC, Manu wrote:
> So this preview has been available for more than 5 years.
> Andrei did a keynote on it, and that seemed generally well received (if not
> a little tepid, because not so many people care about this).
> All the code I've written in the last 5 years doesn't work without this.
> I have exercised this pretty extensively in whatever flavour of code it is
> that I tend to write, and never had any problem. It works like it's meant
> to.
> I would severely struggle to return to a D without it.
>
> Can we un-preview this now?

I have it enabled on all my projects

+1

On Tuesday, 13 August 2024 at 04:23:15 UTC, Manu wrote:
> So this preview has been available for more than 5 years.
> Can we un-preview this now?

https://github.com/dlang/dmd/pull/16778

On Tuesday, 13 August 2024 at 09:11:22 UTC, Nicholas Wilson wrote:
> On Tuesday, 13 August 2024 at 04:23:15 UTC, Manu wrote:
>> So this preview has been available for more than 5 years.
>> Can we un-preview this now?
>
> https://github.com/dlang/dmd/pull/16778

at the moment, no because it doesn't pass CI. Templates with `ref T` with `T==void` (misrecognised untyped lambdas e.g. `str => dst.put(str)` which should be a delegate) give e.g.:
    std/bigint.d(1280): Error: cannot have parameter of type `void`

Are our previews not tested for compatibility?
It kinda feels like preview features should surely get tested, such that we
know the preview represents a valid feature...

On Tue, 13 Aug 2024 at 20:46, Nicholas Wilson via Digitalmars-d < digitalmars-d@puremagic.com> wrote:

> On Tuesday, 13 August 2024 at 09:11:22 UTC, Nicholas Wilson wrote:
> > On Tuesday, 13 August 2024 at 04:23:15 UTC, Manu wrote:
> >> So this preview has been available for more than 5 years. Can we un-preview this now?
> >
> > https://github.com/dlang/dmd/pull/16778
>
> at the moment, no because it doesn't pass CI. Templates with `ref
> T` with `T==void` (misrecognised untyped lambdas e.g. `str =>
> dst.put(str)` which should be a delegate) give e.g.:
>      std/bigint.d(1280): Error: cannot have parameter of type
> `void`
>
>
>

On Thu, 15 Aug 2024 at 00:32, cc via Digitalmars-d < digitalmars-d@puremagic.com> wrote:

> On Tuesday, 13 August 2024 at 04:23:15 UTC, Manu wrote:
> > So this preview has been available for more than 5 years.
> > Andrei did a keynote on it, and that seemed generally well
> > received (if not
> > a little tepid, because not so many people care about this).
> > All the code I've written in the last 5 years doesn't work
> > without this.
> > I have exercised this pretty extensively in whatever flavour of
> > code it is
> > that I tend to write, and never had any problem. It works like
> > it's meant
> > to.
> > I would severely struggle to return to a D without it.
> >
> > Can we un-preview this now?
>
> Where can I find the spec/explanation/DIP for
> -preview=rvaluereference?
> Is it different from
> https://github.com/dlang/DIPs/blob/master/DIPs/rejected/DIP1016.md ?
>

That's my first attempt... then Andrei gave a keynote advocating it (2019?), and it was promptly implemented under this preview flag.

On Thu, 15 Aug 2024 at 01:41, IchorDev via Digitalmars-d < digitalmars-d@puremagic.com> wrote:

> On Tuesday, 13 August 2024 at 10:43:18 UTC, Nicholas Wilson wrote:
> > On Tuesday, 13 August 2024 at 09:11:22 UTC, Nicholas Wilson wrote:
> >> On Tuesday, 13 August 2024 at 04:23:15 UTC, Manu wrote:
> >>> So this preview has been available for more than 5 years. Can we un-preview this now?
> >>
> >> https://github.com/dlang/dmd/pull/16778
> >
> > at the moment, no because it doesn't pass CI. Templates with
> > `ref T` with `T==void` (misrecognised untyped lambdas e.g. `str
> > => dst.put(str)` which should be a delegate) give e.g.:
> >     std/bigint.d(1280): Error: cannot have parameter of type
> > `void`
>
> That’s feels like the silliest reason to not un-preview something, and I bet if we just did it anyway then someone would actually fix that.
>

I'm pretty sure Nick is in support of un-preview-ing it. That's just the state of it...