Macro doe::vec_type

macro_rules! vec_type {
    ($vec:expr) => { ... };
}

get vec type ,return string type value

use doe::*;
assert_eq!(vec_type!(vec![0.2_f64]), format!("Vec<f64>"));
assert_eq!(vec_type!(vec![0.2_f32]), format!("Vec<f32>"));
assert_eq!(vec_type!(vec![2_i32]), format!("Vec<i32>"));
assert_eq!(vec_type!(vec![2_i128]), format!("Vec<i128>"));
assert_eq!(vec_type!(vec![2_isize]), format!("Vec<isize>"));
assert_eq!(vec_type!(vec![2_usize]), format!("Vec<usize>"));