-//! > **Note**: this module is unstable and is designed in [RFC 2504], and you
-//! > can learn more about its status in the [tracking issue].
-//!
-//! [RFC 2504]: https://github.com/rust-lang/rfcs/blob/master/text/2504-fix-error.md
-//! [tracking issue]: https://github.com/rust-lang/rust/issues/53487
-//!