toml 0.8.23

A native Rust encoder and decoder of TOML-formatted files and streams. Provides implementations of the standard Serialize/Deserialize traits for TOML data to facilitate deserializing and serializing Rust structures.
Documentation 
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//! An example showing off the usage of `Deserialize` to automatically decode
//! TOML into a Rust `struct`, with enums.

#![deny(warnings)]
#![allow(dead_code)]

use serde::Deserialize;

/// This is what we're going to decode into.
#[derive(Debug, Deserialize)]
struct Config {
    plain: MyEnum,
    plain_table: MyEnum,
    tuple: MyEnum,
    #[serde(rename = "struct")]
    structv: MyEnum,
    newtype: MyEnum,
    my_enum: Vec<MyEnum>,
}

#[derive(Debug, Deserialize)]
enum MyEnum {
    Plain,
    Tuple(i64, bool),
    NewType(String),
    Struct { value: i64 },
}

fn main() {
    let toml_str = r#"
    plain = "Plain"
    plain_table = { Plain = {} }
    tuple = { Tuple = { 0 = 123, 1 = true } }
    struct = { Struct = { value = 123 } }
    newtype = { NewType = "value" }
    my_enum = [
        { Plain = {} },
        { Tuple = { 0 = 123, 1 = true } },
        { NewType = "value" },
        { Struct = { value = 123 } }
    ]"#;

    let decoded: Config = toml::from_str(toml_str).unwrap();
    println!("{decoded:#?}");
}