Macro cluConstConcat::const_single_data

macro_rules! const_single_data {
    [& $l: lifetime str = $a:expr, $($b:expr),*] => { ... };
    [& $l: lifetime [$type: ty] = $a:expr, $($b:expr),*] => { ... };
    [& $l: lifetime [$type: ty; $size:expr] = $a:expr, $($b:expr),*] => { ... };
    [[$type: ty; $size:expr] = $a:expr, $($b:expr),*] => { ... };
    [[$type: ty] = $a:expr, $($b:expr),*] => { ... };
    [$ty: ty = $a:expr] => { ... };
    () => { ... };
}

Safe designer of single data.

#[macro_use]
extern crate cluConstConcat;

const_data! {
    const S_PREFIX:			&'static str	= "L[";
    const E_PREFIX:			&'static str 	= "]";
    
    const MY_STR:			&'static str	= S_PREFIX, "->", E_PREFIX;
}

fn main() {
    println!("SINGLE_DATA: {:?}", const_single_data!([u8; 2] = b"1", b"2"));
    assert_eq!(b"12", &const_single_data!([u8; 2] = b"1", b"2"));
    
    println!("CONST_STR: {:?}", const_single_data!(&'static str = "!", MY_STR, "!"));
    assert_eq!("!L[->]!", const_single_data!(&'static str = "!", MY_STR, "!"));
}