Re: [PATCH] rust: pin-init: add references to previously initialized fields

[Benno Lossin]

On Mon Sep 8, 2025 at 4:08 AM CEST, Boqun Feng wrote:
> On Mon, Sep 08, 2025 at 01:33:26AM +0200, Danilo Krummrich wrote:
>> On Mon Sep 8, 2025 at 12:51 AM CEST, Benno Lossin wrote:
>> > I actually came up with a third option that looks best IMO:
>> >
>> >     init!(MyStruct {
>> >         x: 42,
>> >         #[with_binding]
>> >         y: 24,
>> >         z: *y,
>> >     })
>> >
>> > The `#[with_binding]` attribute makes the macro generate a variable `y`.
>> > `x` & `z` don't give access to their value. (we of course should come up
>> > with a better name).
>> >
>> > Any thoughts?
>> 
>> It may be a bit verbose is some cases, but it makes things pretty obvious, so
>> LGTM.
>> 
>> How about just #[bind] or #[access]?

I like `#[bind]`.

> #[shadow] or #[maybe_rebind] ? Or #[pin_ref], the last one is clear
> about the purpose.

Hmm in `init!` it's never pinned.

---
Cheers,
Benno