Macro secure_sanitize_struct 

macro_rules! secure_sanitize_struct {
    (
        $(#[$attr:meta])*
        $vis:vis struct $name:ident {
            $(
                $(#[$field_attr:meta])*
                $field_vis:vis $field:ident: $field_ty:ty
            ),* $(,)?
        }
    ) => { ... };
}

Declare a struct and generate SecureSanitize for all fields.

This is a dependency-free alternative to a derive macro. Each field type must implement SecureSanitize. The macro does not implement Drop, so use this form when the type needs custom drop behavior or is wrapped in Secret.

This macro intentionally supports named-field structs without generics or where clauses. For generic structs, implement SecureSanitize manually so the impl generics and bounds stay explicit.

use sanitization::{secure_sanitize_struct, SecretBytes, SecureSanitize};

secure_sanitize_struct! {
    struct Credentials {
        key: SecretBytes<32>,
        nonce: SecretBytes<12>,
    }
}

let mut credentials = Credentials {
    key: SecretBytes::from_array([1; 32]),
    nonce: SecretBytes::from_array([2; 12]),
};

credentials.secure_sanitize();