rust (original) (raw)

Adds impl<T> AsRef<[T]> for vec::IntoIter<T>. This mirrors the same trait impl for slice::Iter. Both types already offer fn as_slice(&self) -> &[T], this just adds the trait impl for vec::IntoIter.

If/when fn as_slice(&self) -> &[T] stabilizes for vec::Drain and slice::IterMut, they should get AsRef<[T]> impls as well. As thus, tangentially related to #58957.

My ultimate goal here: being able to use for<T, I: Iterator<Item=T> + AsRef<[T]>> I to refer to vec::IntoIter, vec::Drain, and eventually array::IntoIter, as an approximation of the set of by-value iterators that can be "previewed" as by-ref iterators. (Actually expressing that as a trait requires GAT.)