---
[dependencies]
toml = "*"
serde = { version = "*", features = ["derive"] }
---
use serde::Deserialize;

#[derive(Deserialize)]
struct Manifest {
    package: Package,
    bench: Vec<Bench>,
}

#[derive(Deserialize)]
struct Package {
}

#[derive(Deserialize)]
struct Bench {
}

fn main() {
    let raw = r#"
[package]
name = "foo"
version = "0.1.0"
edition = "2021"
[[bench.foo]]
"#;
    match toml::from_str::<Manifest>(raw) {
        Ok(manifest) => {},
        Err(err) => {
            println!("{err}");
        }
    }
}