serde_derive 1.0.229: serde_derive::Deserialize

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify serde_derive::Deserialize in pkg:cargo/serde_derive@1.0.229
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/serde_derive@1.0.229
Demonstrate these symbols/APIs:
  - serde_derive::Deserialize

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

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  "kind": "HOW",
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  "symbols": [
    "serde_derive::Deserialize"
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}

//! Clean-room verification sample for serde_derive::Deserialize.

pub use serde_derive::Deserialize;

use serde_derive::Deserialize;

#[derive(Deserialize, Debug, PartialEq)]
struct User {
    id: u64,
    name: String,
    active: bool,
}

fn default_port() -> u16 {
    8080
}

#[derive(Deserialize, Debug, PartialEq)]
struct ServerConfig {
    #[serde(rename = "server_port", alias = "port")]
    #[serde(default = "default_port")]
    port: u16,
    host: String,
}

#[derive(Deserialize, Debug, PartialEq)]
#[serde(deny_unknown_fields)]
struct StrictConfig {
    endpoint: String,
}

#[derive(Deserialize, Debug, PartialEq)]
enum Message {
    Ping,
    Text(String),
    Command { code: i32 },
}

fn main() {
    // 1. #[derive(Deserialize)] deserializes structs with primitive, string, and boolean named fields
    let user_json = r#"{"id":1001,"name":"alice","active":true}"#;
    let user: User = serde_json::from_str(user_json).expect("deserialize User");
    assert_eq!(
        user,
        User {
            id: 1001,
            name: "alice".to_string(),
            active: true,
        }
    );

    // 2. #[derive(Deserialize)] deserializes enums with unit, tuple, and struct variants
    let ping: Message = serde_json::from_str(r#""Ping""#).expect("deserialize Message::Ping");
    assert_eq!(ping, Message::Ping);

    let text: Message = serde_json::from_str(r#"{"Text":"hello"}"#).expect("deserialize Message::Text");
    assert_eq!(text, Message::Text("hello".to_string()));

    let cmd: Message = serde_json::from_str(r#"{"Command":{"code":42}}"#).expect("deserialize Message::Command");
    assert_eq!(cmd, Message::Command { code: 42 });

    // 3. serde field attributes rename, default, and alias alter struct field deserialization behavior
    let config_with_rename: ServerConfig =
        serde_json::from_str(r#"{"server_port":9000,"host":"localhost"}"#).expect("deserialize with rename");
    assert_eq!(
        config_with_rename,
        ServerConfig {
            port: 9000,
            host: "localhost".to_string(),
        }
    );

    let config_with_default: ServerConfig =
        serde_json::from_str(r#"{"host":"localhost"}"#).expect("deserialize with default");
    assert_eq!(
        config_with_default,
        ServerConfig {
            port: 8080,
            host: "localhost".to_string(),
        }
    );

    let config_with_alias: ServerConfig =
        serde_json::from_str(r#"{"port":7070,"host":"localhost"}"#).expect("deserialize with alias");
    assert_eq!(
        config_with_alias,
        ServerConfig {
            port: 7070,
            host: "localhost".to_string(),
        }
    );

    // 4. serde container attribute deny_unknown_fields rejects unexpected fields during deserialization
    let valid_strict: StrictConfig =
        serde_json::from_str(r#"{"endpoint":"api.example.com"}"#).expect("deserialize valid strict");
    assert_eq!(
        valid_strict,
        StrictConfig {
            endpoint: "api.example.com".to_string(),
        }
    );

    let invalid_strict: Result<StrictConfig, _> =
        serde_json::from_str(r#"{"endpoint":"api.example.com","extra":true}"#);
    assert!(
        invalid_strict.is_err(),
        "deny_unknown_fields must reject unexpected fields"
    );

    println!("All serde_derive::Deserialize contract assertions passed.");
}