Auto merge of #130829 - Urgau:option_array_transpose, r=ibraheemdev

Add `[Option<T>; N]::transpose`

This PR as a new unstable libs API, `[Option<T>; N]::transpose`, which permits going from `[Option<T>; N]` to `Option<[T; N]>`.

This new API doesn't have an ACP as it was directly asked by T-libs-api in https://github.com/rust-lang/rust/issues/97601#issuecomment-2372109119:

> [..] but it'd be trivial to provide a helper method `.transpose()` that turns array-of-Option into Option-of-array (**and we think that method should exist**; it already does for array-of-MaybeUninit).

r? libs
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bors 2024-10-02 04:31:15 +00:00
commit 0e5fce7242

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