Function box_assume_init_into_vec_unsafe 

#[doc(hidden)]
pub fn box_assume_init_into_vec_unsafe<T, const N: usize>(
    b: Box<MaybeUninit<[T; N]>>,
) -> Vec<T>

🔬This is a nightly-only experimental API. (liballoc_internals)

Helper for vec!.

This is unsafe, but has to be marked as safe or else we couldn’t use it in vec!.