David Tolnay 4bddf1b953 Override diagnostic::on_unimplemented message of all serde_core traits
This prevents diagnostics being rendered like `serde_core::ser::Serialize`
and `serde_core::de::Deserialize` in projects that have no direct
dependency on serde_core.

The attributes make error messages arguably sometimes worse than
pre-serde_core by always rendering `serde::Serialize` and never
`Serialize` when `use serde::Serialize` is in scope, which rustc's
default message construction knows to recognize. But this is probably
negligible.

I explored the alternative of setting `[lib] name = "serde"` in
serde_core/Cargo.toml which also prevents `serde_core::ser::Serialize`
in messages, but has the unwanted effect of also inserting the following
noise into every such error:

    note: there are multiple different versions of crate `serde` in the dependency graph
        --> $WORKSPACE/serde_core/src/ser/mod.rs:225:1
         |
     225 | pub trait Serialize {
         | ^^^^^^^^^^^^^^^^^^^ this is the required trait
         |
        ::: src/main.rs:1:1
         |
       1 | struct MyStruct;
         | --------------- this type doesn't implement the required trait
    ...
       4 |     let _ = serde_json::to_string(&MyStruct);
         |             ----------
         |             |
         |             one version of crate `serde` used here, as a dependency of crate `serde`
         |             one version of crate `serde` used here, as a dependency of crate `serde_json`
         |
        ::: $WORKSPACE/serde/src/private/de.rs:2347:1
         |
    2347 | pub trait IdentifierDeserializer<'de, E: Error> {
         | ----------------------------------------------- this is the found trait
         = help: you can use `cargo tree` to explore your dependency tree

The "this is the found trait" pointing to `IdentifierDeserializer` seems
like a compiler bug...
2025-09-13 13:59:52 -07:00
2025-01-23 01:41:05 -08:00
2018-11-24 15:53:09 -08:00

Serde Build Status Latest Version serde msrv serde_derive msrv

Serde is a framework for serializing and deserializing Rust data structures efficiently and generically.


You may be looking for:

Serde in action

Click to show Cargo.toml. Run this code in the playground.
[dependencies]

# The core APIs, including the Serialize and Deserialize traits. Always
# required when using Serde. The "derive" feature is only required when
# using #[derive(Serialize, Deserialize)] to make Serde work with structs
# and enums defined in your crate.
serde = { version = "1.0", features = ["derive"] }

# Each data format lives in its own crate; the sample code below uses JSON
# but you may be using a different one.
serde_json = "1.0"

use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize, Debug)]
struct Point {
    x: i32,
    y: i32,
}

fn main() {
    let point = Point { x: 1, y: 2 };

    // Convert the Point to a JSON string.
    let serialized = serde_json::to_string(&point).unwrap();

    // Prints serialized = {"x":1,"y":2}
    println!("serialized = {}", serialized);

    // Convert the JSON string back to a Point.
    let deserialized: Point = serde_json::from_str(&serialized).unwrap();

    // Prints deserialized = Point { x: 1, y: 2 }
    println!("deserialized = {:?}", deserialized);
}

Getting help

Serde is one of the most widely used Rust libraries so any place that Rustaceans congregate will be able to help you out. For chat, consider trying the #rust-questions or #rust-beginners channels of the unofficial community Discord (invite: https://discord.gg/rust-lang-community), the #rust-usage or #beginners channels of the official Rust Project Discord (invite: https://discord.gg/rust-lang), or the #general stream in Zulip. For asynchronous, consider the [rust] tag on StackOverflow, the /r/rust subreddit which has a pinned weekly easy questions post, or the Rust Discourse forum. It's acceptable to file a support issue in this repo but they tend not to get as many eyes as any of the above and may get closed without a response after some time.


License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Serde by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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