rust打印变量类型

use std::collections::HashSet;

fn print_type_of<T>(_: &T) {
    println!("{}", std::any::type_name::<T>())
}

fn main() {
    let mut s = HashSet::new();
    let ve = vec![1, 2, 1, 3, 2, 4];
    print_type_of(&s);
    for v in &ve {
        println!("{}", s.insert(v));
    }
}