Get `!nonnull` metadata on slice iterators, without `assume`s#113344

Merged

bors merged 1 commit intorust-lang:masterfrom scottmcm:alt-slice-zst-handing

Jul 21, 2023

+170-93

Commits on Jul 20, 2023

Get !nonnull metadata consistently in slice iterators, without needing assumes
scottmcm
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