Convert `Into<Box<[T]>> for Vec<T>` into `From<Vec<T>> for Box<[T]>` As the `collections` crate has been merged into `alloc` in #42648 this impl is now possible. This is the final part of #42129 missing from #42227.
collections
alloc
Alloc
RawVec
Into<Box<[T]>> for Vec<T>
From<Vec<T>> for Box<[T]>