Macro hashmap 

macro_rules! hashmap {
    () => { ... };
    ($(||)+) => { ... };
    ($($k: expr => $v: expr),+ $(,)*) => { ... };
}

macro for HashMap

 use doe::*;
 use std::collections::HashMap;
 let mut map:HashMap<i32,i32> = hashmap!();
 map.insert(0, 1);
 let map1 = hashmap!(2=>5,3=>4);