Rust's composibiliity inside a method / function doesn't really matter because it's easy to fix. For me composibility problems with Rust come up with lifetime

Rust's composibiliity inside a method / function doesn't really matter because it's easy to fix. For me composibility problems with Rust come up with lifetimes, that's why I would like to give names to lifetimes of variables inside functions: as a step before extacting functions from it that isn't always possible.