Macro cogo::hash_map

macro_rules! hash_map {
    {$(,)?} => { ... };
    { $($key:tt:$value:expr),+   $(,)?} => { ... };
}

make an hash map for example:

use cogo::hash_map;

let f=1;
let v=7;
let m = hash_map!{
        1:1,
        2:2,
        f:v,
        6:9*2
    };