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Rollup merge of #158282 - ArhanChaudhary:unchecked-subslice, r=tgross35,jhpratt
slice_split_once: bounds check optimization note
Tracking issue: https://github.com/rust-lang/rust/issues/112811
~~Use unchecked sub-slicing operations for `<T>::split_once` and `<T>::rsplit_once`.~~
Note that unchecked sub-slicing operations are equivalent to the current checked sub-slicing operations.
