Is it possible to continue on error, but ignore that parts that failed parsing?

[acheronfail]

Is it possible to have figment return all the successfully parsed items, and ignore the ones it didn't know about? Consider this example:

// main.rs
use figment::{
    providers::{Format, Toml},
    Figment,
};
use serde_derive::Deserialize;
use std::path::PathBuf;

#[derive(Debug, Deserialize)]
#[serde(rename_all = "snake_case", tag = "type")]
enum MyEnum {
    A,
    B,
}

#[derive(Debug, Deserialize)]
struct Config {
    #[allow(unused)]
    values: Vec<MyEnum>,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let cfg_file = PathBuf::from("config");
    let figment = Figment::new().merge(Toml::file(cfg_file.with_extension("toml")));
    let config = figment.extract::<Config>()?;
    println!("{:?}", config);

    Ok(())
}

# config.toml
[[values]]
type = "a"

[[values]]
type = "b"

[[values]]
type = "not_a_real_type"

# Cargo.toml
[package]
name = "test_figment"
version = "0.1.0"
edition = "2021"

[dependencies]
figment = { version = "0.10.19", features = ["toml"] }
serde = "1.0.217"
serde_derive = "1.0.217"
serde_json = "1.0.138"

Right now, this example fails completely with an UnknownVariant error (rightly so, since there's an enum that's not known).
I'm wondering, if there's a way to return all the config that was parsed, and ignore parts of it that failed? 🤔

For an application I'm making, it would be useful to continue with as much info as possible rather than fail completely on a parsing error...

[duncanista]

I'd also love to have something like this, I have customers who might be setting a value incorrectly, I'd like to still continue and just warn them about a misconfiguration, not necessarily requiring the app to not use their config and use the default. As I'd like to just use a default for a specific field.

[duncanista]

@SergioBenitez any idea on how this could be achieved? Happy to raise a PR