Forgive the non-versioned link: https://doc.rust-lang.org/1.81.0/src/core/iter/adapters/flatten.rs.html#618 https://doc.rust-lang.org/1.81.0/src/core/iter/adap

Forgive the non-versioned link: https://doc.rust-lang.org/1.81.0/src/core/iter/adapters/flatten.rs.html#618 https://doc.rust-lang.org/1.81.0/src/core/iter/adapters/flat... I think it does work correctly.