The feature gate for the issue is #![feature(array_chunks)].

Also tracks as_(r)chunks(_mut) in #![feature(slice_as_chunks)] -- these were FCPed starting at #74985 (comment) below.

About tracking issues

Tracking issues are used to record the overall progress of implementation.
They are also uses as hubs connecting to other relevant issues, e.g., bugs or open design questions.
A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature.
Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.

Steps

• Restrict N to values greater than 0 at compile time instead of using a runtime panic. Make <[T]>::array_* methods fail to compile on 0 len arrays #99471
• Support calls where N == 0 is unreachable due to conditionals Tracking Issue for slice::array_chunks #74985 (comment)
  • It was decided that a runtime panic is appropriate: Tracking Issue for slice::array_chunks #74985 (comment)
• Adjust documentation (see instructions on rustc-dev-guide)
• Stabilization PR (see instructions on rustc-dev-guide)
  • slice_as_chunks: Stabilize slice_as_chunks library feature #139656
  • array_chunks

Unresolved Questions

• Iterator vs slices, Does [T]::array_chunks really need to be an iterator? #76354

Implementation history

• implemented in add slice::array_chunks to std #74373
• mut version in Add slice::array_chunks_mut #75021
• as_chunks{_mut} in Add [T]::as_chunks(_mut) #76635
• as_rchunks{_mut} and unchecked versions in Add as_rchunks (and friends) to slices #78818
• const as_(r)chunk in constify slice_as_chunks (unstable) #111453
• Stabilize slice_as_chunks library feature #139656