How to use derive_more crate in Rust derive macros

Use the derive_more crate by adding it to your Cargo.toml with the specific feature flags you need, then apply the corresponding derive macro to your struct or enum.

[dependencies]
derive_more = { version = "2", features = ["deref", "deref_mut", "display", "error", "from"] }

use derive_more::{Deref, DerefMut, Display};

#[derive(Debug, Deref, DerefMut, Display)]
pub struct NamedFile {
    #[deref]
    #[deref_mut]
    file: File,
    path: PathBuf,
}

The Deref and DerefMut attributes on the file field allow NamedFile to automatically behave like a File when called with & or &mut, while Display generates the fmt implementation based on the struct's fields.

The derive_more crate automatically generates common Rust code for your types, saving you from writing repetitive boilerplate. It acts like a smart assistant that fills in the missing pieces for traits like Display or Deref so you can focus on your logic. You simply list the traits you need in your Cargo.toml and attach them to your data structures.