Macro stru_t 

macro_rules! stru_t {
    ($($t:tt)*) => { ... };
}

Generate anonymous struct type.

Sometimes you may need to know the exact type of an anonymous struct object.

Just like how a named struct type is declared, you declare a field name, followed by a colon, and then its type. Finally, you separate each field with commas.

use structz::*;

type Person = stru_t! {
    name: &'static str,
    age: u8,
};

let person: Person = stru! {
    age: 15,
    name: "Alice",
};

For cases where the anonymous structs are used as function arguments, it is recommended that you use the [macro@named_args] instead.