serde_derive 1.0.229

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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 pkg:cargo/serde_derive@1.0.229
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/serde_derive@1.0.229

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.

{"case":{"caseId":"case:sha256:b1b7ecb9f3967cb896ec068941dfda5b34ba163b3b0edface3803fd426bc620d","contract":["#[derive(Serialize, Deserialize)] serializes and deserializes structs with named fields","serde field attributes rename, default, and skip alter struct field serialization and deserialization","serde container attributes rename_all and deny_unknown_fields govern struct field mapping and validation","#[derive(Serialize, Deserialize)] serializes and deserializes enums with unit, tuple, and struct variants"],"goal":"verify pkg:cargo/serde_derive@1.0.229","kind":"HOW","packages":["pkg:cargo/serde_derive@1.0.229"],"schemaVersion":1},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/serde_derive@1.0.229"],"schemaVersion":1,"subject":"pkg:cargo/serde_derive@1.0.229","verifierAdapter":"cargo@1"}

{
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  "kind": "HOW",
  "packages": [
    "pkg:cargo/serde_derive@1.0.229"
  ]
}

//! Clean-room verification sample for serde_derive.

pub use serde_derive::*;

use serde_derive::{Deserialize, Serialize};

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

fn default_port() -> u16 {
    8080
}

#[derive(Serialize, Deserialize, Debug, PartialEq)]
struct FieldConfig {
    #[serde(rename = "config_id")]
    id: u32,
    #[serde(default = "default_port")]
    port: u16,
    #[serde(skip)]
    internal_flag: bool,
}

#[derive(Serialize, Deserialize, Debug, PartialEq)]
#[serde(rename_all = "kebab-case", deny_unknown_fields)]
struct ServerSettings {
    host_name: String,
    max_conns: usize,
}

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

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

    // 2. serde field attributes rename, default, and skip alter struct field serialization and deserialization
    let config = FieldConfig {
        id: 42,
        port: 9000,
        internal_flag: true,
    };
    let config_json = serde_json::to_string(&config).expect("serialize FieldConfig");
    assert_eq!(config_json, r#"{"config_id":42,"port":9000}"#);
    let config_de: FieldConfig =
        serde_json::from_str(r#"{"config_id":42}"#).expect("deserialize FieldConfig with default");
    assert_eq!(config_de.id, 42);
    assert_eq!(config_de.port, 8080);
    assert!(!config_de.internal_flag);

    // 3. serde container attributes rename_all and deny_unknown_fields govern struct field mapping and validation
    let settings = ServerSettings {
        host_name: "127.0.0.1".to_string(),
        max_conns: 128,
    };
    let settings_json = serde_json::to_string(&settings).expect("serialize ServerSettings");
    assert_eq!(settings_json, r#"{"host-name":"127.0.0.1","max-conns":128}"#);
    let settings_de: ServerSettings =
        serde_json::from_str(&settings_json).expect("deserialize ServerSettings");
    assert_eq!(settings, settings_de);
    let unknown_field_res: Result<ServerSettings, _> =
        serde_json::from_str(r#"{"host-name":"127.0.0.1","max-conns":128,"unexpected":true}"#);
    assert!(
        unknown_field_res.is_err(),
        "deny_unknown_fields must reject unexpected fields"
    );

    // 4. #[derive(Serialize, Deserialize)] serializes and deserializes enums with unit, tuple, and struct variants
    let quit = Action::Quit;
    let quit_json = serde_json::to_string(&quit).expect("serialize Action::Quit");
    assert_eq!(quit_json, r#""Quit""#);
    let quit_de: Action = serde_json::from_str(&quit_json).expect("deserialize Action::Quit");
    assert_eq!(quit, quit_de);

    let mv = Action::Move { x: 10, y: -5 };
    let mv_json = serde_json::to_string(&mv).expect("serialize Action::Move");
    assert_eq!(mv_json, r#"{"Move":{"x":10,"y":-5}}"#);
    let mv_de: Action = serde_json::from_str(&mv_json).expect("deserialize Action::Move");
    assert_eq!(mv, mv_de);

    let write = Action::Write("payload".to_string());
    let write_json = serde_json::to_string(&write).expect("serialize Action::Write");
    assert_eq!(write_json, r#"{"Write":"payload"}"#);
    let write_de: Action = serde_json::from_str(&write_json).expect("deserialize Action::Write");
    assert_eq!(write, write_de);

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