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Tracking Issue for Vec::from_fn #149698
Description
Feature gate: #![feature(vec_from_fn)]
This is a tracking issue for the Vec::from_fn method.
Public API
impl<T> Vec<T> {
pub fn from_fn<F>(length: usize, f: F) -> Self
where
F: FnMut(usize) -> T,
{
(0..length).map(f).collect()
}
}Steps / History
(Remember to update the S-tracking-* label when checking boxes.)
- ACP: Support
vec![const { ... }; n]syntax for creating aVecof non-Clonevalues libs-team#484 (comment) - Implementation: Implement
Vec::from_fn#149699 - Final comment period (FCP)1
- Stabilization PR: Stabilize
Vec::from_fn#162685
Unresolved Questions
- None yet.
Activity
Rollup merge of rust-lang#149699 - EFanZh:vec-from-fn, r=joboet
Unrolled build for #149699
EFanZh commentedon Dec 7, 2025
@rustbot label -S-tracking-unimplemented
callmeclover commentedon May 28, 2026
@Amanieu this has been implemented for a good few months with no questions, could we start the FCP?
Amanieu commentedon May 29, 2026
@rfcbot merge libs-api
rust-rfcbot commentedon May 29, 2026
Team member @Amanieu has proposed to merge this. The next step is review by the rest of the tagged team members:
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.
rust-rfcbot commentedon Jun 2, 2026
🔔 This is now entering its final comment period, as per the review above. 🔔
rust-rfcbot commentedon Jun 12, 2026
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.
Rollup merge of rust-lang#162685 - EFanZh:stabilize-vec-from-fn, r=ha…
Unrolled build for #162685 in rollup 162687
EFanZh commentedon Sep 13, 2026
Stabilized: #162685.