Add some conversion trait impls - `impl<T, const N: usize> From<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>` (cc rust-lang#96097) - `impl<T, const N: usize> AsRef<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>` (cc rust-lang#96097) - `impl<T, const N: usize> AsRef<[MaybeUninit<T>]> for MaybeUninit<[T; N]>` (cc rust-lang#96097) - `impl<T, const N: usize> AsMut<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]>` (cc rust-lang#96097) - `impl<T, const N: usize> AsMut<[MaybeUninit<T>]> for MaybeUninit<[T; N]>` (cc rust-lang#96097) - `impl<T, const N: usize> From<MaybeUninit<[T; N]>> for [MaybeUninit<T>; N]` (cc rust-lang#96097) - `impl<T, const N: usize> AsRef<[Cell<T>; N]> for Cell<[T; N]>` (equivalent of `as_array_of_cells`, cc rust-lang#88248) - `impl<T, const N: usize> AsRef<[Cell<T>]> for Cell<[T; N]>` - `impl<T> AsRef<[Cell<T>]> for Cell<[T]>` (equivalent of `as_slice_of_cells`) @rustbot label T-libs-api needs-fcp -T-libs I’ve tried to only add impls that are unlikely to cause single-applicable-impl inference breakage.

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