I have a custom json deserializer. It can parse string or number.
json functions return Result enum so I guess if it fails it should return
Err. But lines println!("crap") or println!("string is ok") are not
reached.
Program crashes with the following output:
not int. let's try string
task '<main>' failed at 'called `Option::unwrap()` on a `None` value',
/home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libcore/
option.rs:278
extern crate serialize;
use serialize::{json, Decodable, Decoder};
fn main() {
let raw_json = "\"ddd\"";
let person: Primitive = json::decode(raw_json).unwrap();
println!("{}", person);
}
#[deriving(Show)]
enum Primitive { ItInt(int), ItStr(String) }
impl<S: Decoder<E>, E> Decodable<S, E> for Primitive {
fn decode(decoder: &mut S) -> Result<Primitive, E> {
match decoder.read_int() {
Ok(n) => Ok(ItInt(n)),
_ => {
println!("not int. let's try string");
match decoder.read_str() {
Ok(s) => {
println!("string is ok");
Ok(ItStr(s))
},
_ => {
println!("crap");
Ok(ItStr("DDD".to_string()))
}
}
}
}
}
}
--
Daneel S. Yaitskov
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