1 Lexical Region Resolution was removed in https://github.com/rust-lang/rust/pull/64790.
3 Rust now uses Non-lexical lifetimes. For more info, please see the [borrowck
4 chapter][bc] in the rustc-dev-guide.
6 [bc]: https://rustc-dev-guide.rust-lang.org/borrow_check/region_inference.html