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Advanced Rust macros with derive-deftly

derive-deftly is a Rust package that you can use to define your own derive macros without having to write low-level procedural macros. The syntax is easy to learn, but powerful enough to implement macros of significant complexity. Just below is a simple example, to help you get a feel for the system. There is also comprehensive and rigorous reference material: Suppose you want to add accessor functions for the fields in your struct . You could do it by hand, like this: #![allow(unused)] fn