serde-untagged-intmap-fail.rs

#[macro_use]
extern crate serde_derive;
extern crate serde;
extern crate serde_json;

use std::collections::HashMap;

#[derive(Debug, Serialize, Deserialize)]
#[serde(untagged)]
enum Chicken {
	Chicken { chicken: HashMap<usize,usize> }
}

#[derive(Debug, Serialize, Deserialize)]
struct Chicken2 {
	chicken: HashMap<usize,usize>
}

fn main() {
	let ch = Chicken::Chicken { chicken: [(12,23)].iter().cloned().collect() };
	let ch2 = Chicken2 { chicken: [(12,23)].iter().cloned().collect() };
	let s = serde_json::to_string(&ch).unwrap();
	let s2 = serde_json::to_string(&ch2).unwrap();
	assert_eq!(s, s2);                                      // This succeeds.
	let cx2: Chicken2 = serde_json::from_str(&s2).unwrap(); // This also succeeds.
	println!("{:?} => {} => {:?}", ch2, s2, cx2);
	println!("{:?} => {}", ch, s);
	let cx: Chicken = serde_json::from_str(&s).unwrap();    // This panics.
	println!("{:?} => {} => {:?}", ch, s, cx);
}