serde_derive 1.0.229: 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 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:
  - 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": [
    "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 FieldConfig {
    #[serde(rename = "config_id", alias = "legacy_id")]
    id: u32,
    #[serde(default = "default_port")]
    port: u16,
    #[serde(default)]
    enabled: bool,
}

#[derive(Deserialize, Debug, PartialEq)]
#[serde(deny_unknown_fields)]
struct StrictSettings {
    host: String,
    port: u16,
}

#[derive(Deserialize, Debug, PartialEq)]
enum Action {
    Quit,
    Move { x: i32, y: i32 },
    Write(String),
}

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 quit_action: Action = serde_json::from_str(r#""Quit""#).expect("deserialize Action::Quit");
    assert_eq!(quit_action, Action::Quit);

    let move_action: Action =
        serde_json::from_str(r#"{"Move":{"x":10,"y":-5}}"#).expect("deserialize Action::Move");
    assert_eq!(move_action, Action::Move { x: 10, y: -5 });

    let write_action: Action =
        serde_json::from_str(r#"{"Write":"hello"}"#).expect("deserialize Action::Write");
    assert_eq!(write_action, Action::Write("hello".to_string()));

    // 3. serde field attributes rename, default, and alias alter struct field deserialization behavior
    let config_with_rename: FieldConfig =
        serde_json::from_str(r#"{"config_id":42}"#).expect("deserialize with rename and default");
    assert_eq!(
        config_with_rename,
        FieldConfig {
            id: 42,
            port: 8080,
            enabled: false,
        }
    );

    let config_with_alias: FieldConfig =
        serde_json::from_str(r#"{"legacy_id":99,"port":3000,"enabled":true}"#)
            .expect("deserialize with alias");
    assert_eq!(
        config_with_alias,
        FieldConfig {
            id: 99,
            port: 3000,
            enabled: true,
        }
    );

    // 4. serde container attribute deny_unknown_fields rejects unexpected fields during deserialization
    let valid_settings: StrictSettings =
        serde_json::from_str(r#"{"host":"localhost","port":80}"#).expect("deserialize valid settings");
    assert_eq!(
        valid_settings,
        StrictSettings {
            host: "localhost".to_string(),
            port: 80,
        }
    );

    let invalid_json = r#"{"host":"localhost","port":80,"extra":123}"#;
    let err_res: Result<StrictSettings, _> = serde_json::from_str(invalid_json);
    assert!(
        err_res.is_err(),
        "deny_unknown_fields must reject unexpected fields"
    );

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