Macro doe::vec_element_position_all

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

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]);
let v2 = vec_element_position_all!(vec!["0".to_string(),"4".to_string(),"7".to_string(),"7".to_string(),], "7".to_string());
assert_eq!(v2, vec![2,3]);