Rust's linting tool, Clippy, provides a lint that will produce a warning when a function pointer is cast to any integral type: https://rust-lang.github.io/rust-

Rust's linting tool, Clippy, provides a lint that will produce a warning when a function pointer is cast to any integral type: https://rust-lang.github.io/rust-clippy/master/index.html#/fn_to_numeric_cast_any https://rust-lang.github.io/rust-clippy/master/index.html#/f... The broader topic of whether it is safe, or wise, to cast between pointers and integers in general is an area of active research. Ralf Jung's blog is required reading on this topic: https://www.ralfj.de/blog/2022/04/11/provenance-exposed.html https://www.ralfj.de/blog/2022/04/11/provenance-exposed.html