JSON decoding fails on trailing comma

[kvark]

extern crate debug;
extern crate serialize;
use serialize::json;

#[deriving(Decodable)]
struct Spec {
    pub schema: String,
}

static INPUT: &'static str = "
{
    \"schema\" : \"xxx\",
}
";

fn main() {
    println!("{:?}", json::decode::<Spec>(INPUT));
}

Gives me:

task '

' failed at 'assertion failed: !self.is_empty()', /build/rust-git/src/rust/src/libserialize/json.rs:1206

[steveklabnik]

That's because JSON doesn't allow for a trailing comma, I'd imagine.

[mahkoh]

The standard specification is clearly wrong here and the decoder should accept trailing commas.

[steveklabnik]

Well, that's not how standards work.

[mahkoh]

Not sure what you mean by that. I'm not saying that the encoder should produce trailing commas.

[mahkoh]

There is some precedence for not allowing trailing commas: Go, Chromium, and Firefox reject such json. The specification is still wrong for not allowing them and I see no reason not to parse them.

[kvark]

@steveklabnik sad but true. Please feel free to close the issue then.

[kvark]

We could, however, have a better error message.

[lucy]

It shouldn't fail, since it returns a Result containing possible parse errors.