N00b question: debugging Serialize trait implementation

1

Here's my code:

extern crate serde;
use crate::serde::ser::Serialize;

#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
pub enum HcNodeID {
    None,
    ID(usize)
}

impl serde::ser::Serialize for HcNodeID {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::ser::Serializer
    {
        match self {
            HcNodeID::ID(id) => serializer.serialize_u64(*id as u64),
            HcNodeID::None => serializer.serialize_str("INVALID"),
        }
    }
}

fn main() {

    let mut the_builder = serde_hjson::builder::ObjectBuilder::new();;

    let my_id : HcNodeID = HcNodeID::None;
    let mut json_builder = the_builder.insert("id", my_id);

    println!("{}", json_builder.unwrap());
}

And I get this error:

29 |     let mut json_builder = the_builder.insert("id", my_id);
   |                                        ^^^^^^ the trait `serde::ser::Serialize` is not 
implemented for `HcNodeID`

I'm sorry if this is an idiotic question, but I can't seem to understand what's going wrong. It seems like the trait implementation is right there, and other traits seem to work just fine.

Thank you!

2

What versions of serde and serde_hjson are you using?

3

Thanks for the reply!

In my Cargo.toml file, I have:

serde = "0.9"
serde-hjson = "*"

I started with:

serde = "*"
serde-hjson = "*"

But then I read somewhere that a version incompatibility might be the problem, so I tried a bunch of permutations, but ultimately nothing changed.

serde = "1.0"

and above doesn't compile, giving the error:

error[E0412]: cannot find type `NonZeroI8` in module `num`

And a whole bunch more like it.

4

The serde-hjson crate is abandoned and does not support any serde version from the past 3 years. I would recommend not using it.

5

Thanks for the info. I spent a few hours trying to bring serde-hjson up to date with the latest serde interfaces, but it started to feel like a can of worms. It's is a bit more of a project than I can bite off right now, but I may be able to set aside a few days for it in the future. hjson is just so much friendlier than normal json.

On a different note, it was not the best error from rustc, I must say. I had no idea that the compiler was trying to tell me that two incompatible versions of the trait existed simultaneously with the same name. That the version of the trait I was implementing isn't the version used by the crate I was calling.

Anyway, thanks for the info. Am I the only person who wants a working hjson crate, or is there value for the community if I invest the time to bring it up to date?

Thanks again.

6

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