Rust: Tracking issue for core::iter::once_with()

[stjepang]

This is the tracking issue for core::iter::once_with().
Currently in nightly, PR = #57579.

[stjepang]

Is this function now ready for stabilization?

[SimonSapin]

I don’t see why not.

Tracked here:

pub fn once_with<A, F: FnOnce() -> A>(gen: F) -> OnceWith<F> {…}
pub struct OnceWith<F> {…}
impl<A, F: FnOnce() -> A> Iterator for OnceWith<F> {…}
impl<A, F: FnOnce() -> A> DoubleEndedIterator for OnceWith<F> {…}
impl<A, F: FnOnce() -> A> ExactSizeIterator for OnceWith<F> {…}
impl<A, F: FnOnce() -> A> FusedIterator for OnceWith<F> {…}
unsafe impl<A, F: FnOnce() -> A> TrustedLen for OnceWith<F> {…}

@rfcbot fcp merge

[rfcbot]

Team member @SimonSapin has proposed to merge this. The next step is review by the rest of the tagged team members:

• [x] @Amanieu
• [x] @KodrAus
• [x] @SimonSapin
• [x] @alexcrichton
• [x] @dtolnay
• [x] @sfackler
• [ ] @withoutboats

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

[rfcbot]

:bell: This is now entering its final comment period, as per the review above. :bell:

[rfcbot]

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

The RFC will be merged soon.

[ollie27]

I noticed that this iterator has been stabilized a Copy impl which I assume wasn't intentional so I've submitted #68810 to remove it.