// https://github.com/bourumir-wyngs/serde-saphyr/issues/7
use {serde_saphyr::*, std::collections::*};
pub fn main() {
let mut map1 = HashMap::new();
map1.insert("key1", "value1");
let mut map2 = HashMap::new();
map2.insert("key2", map1);
let mut map3 = HashMap::new();
map3.insert("key3", map2);
let mut map4 = HashMap::new();
map4.insert("key4", map3);
let mut string = String::default();
to_fmt_writer(&mut string, &map4).unwrap();
print!("{}", string);
}