thiserror 2.0.18

derive(Error)
Documentation 
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use thiserror::Error;

#[derive(Error, Debug)]
#[error("error: {r#fn}")]
pub struct Error {
    r#fn: &'static str,
}

fn main() {
    let r#fn = "...";
    let _ = format!("error: {r#fn}");
}