How to make serde with one level of indirection report the field that failed, if the indirection failed?

help
1

This program will error, but it will not tell you which field errored.

use serde::{Deserialize};
use serde_json;

#[derive(Deserialize)]
struct Test {
    _foo: usize,
    _bar: Bar,
}

#[derive(Deserialize)]
#[serde(try_from = "BarDe")]
struct Bar(usize);

#[derive(Deserialize)]
#[serde(transparent)]
struct BarDe(i32);

impl TryFrom<BarDe> for Bar {
    type Error = &'static str;
    fn try_from(_: BarDe) -> Result<Self, &'static str> {
        Err("this field is erroneous")
    }
}

fn main() {
    let _: Test = serde_json::from_str(r#"{"_foo": 1, "_bar": 2}"#).unwrap();
}

playground link

I wonder if there is a pretty/succinct way to get the field name that failed to deseriliaze?

I thought about adding a #[track_caller] to the try_from, but that gives me code location, not a helpful field name.

2

serde_path_to_error?

3

Thank you!