Macro doe::vec_element_position_all

macro_rules! vec_element_position_all {
    ($vec:expr,$element:expr) => { ... };
}

vec_element_position_all!() used to find element position and collect into Vec

use doe::*;
let v1 = vec_element_position_all!(vec![1, 2, 5, 3, 6, 2, 2], 2);
assert_eq!(v1, vec![1, 5, 6]);