Macro impl_redacted_debug 

macro_rules! impl_redacted_debug {
    ($ty:ty) => { ... };
}

Implements release Debug by delegating to Display.

Pair this with #[cfg_attr(debug_assertions, derive(Debug))] on error types whose fields may contain sensitive runtime detail. Do not use #[derive(Debug)] unconditionally: in release that either conflicts with the impl emitted here or, if this macro is omitted, leaks every field through the derived Debug.

#[cfg_attr(debug_assertions, derive(Debug))]
struct MyError(String);

impl std::fmt::Display for MyError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str("public")
    }
}

redacted_error::impl_redacted_debug!(MyError);

let err = MyError("secret".into());
let _ = format!("{err:?}");