Hi, the rust standard library is going to remove the unstable #![feature(raw_vec_internals] (RawVec) feature in upcoming nightlies (see rust-lang/rust#90542) since it was only for compiler-internal use and not on a path to stabilization.
A crater run found that this crate uses it and will be broken by the removal. You may want to switch to Box<[MaybeUninit<T>]>, Vec or the Allocator API instead.