Clippy's suggested fix is not valid in 2018 edition. The
serde_test_suite crate can't be updated to 2021 edition yet because CI
of the serde crate on old toolchains needs to be able to parse all
manifests in the workspace, even if serde_test_suite is not being
compiled in those builds.
error: variables can be used directly in the `format!` string
--> test_suite/tests/test_de.rs:2260:23
|
2260 | Err(e) => panic!("tokens failed to deserialize: {}", e),
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
= note: `-D clippy::uninlined-format-args` implied by `-D clippy::pedantic`
help: change this to
|
2260 - Err(e) => panic!("tokens failed to deserialize: {}", e),
2260 + Err(e) => panic!("tokens failed to deserialize: {e}"),
|
warning: unused variable: `e`
--> test_suite/tests/test_de.rs:2260:17
|
2260 | Err(e) => panic!("tokens failed to deserialize: {e}"),
| ^ help: if this is intentional, prefix it with an underscore: `_e`
|
= note: `#[warn(unused_variables)]` on by default
warning: panic message contains an unused formatting placeholder
--> test_suite/tests/test_de.rs:2260:61
|
2260 | Err(e) => panic!("tokens failed to deserialize: {e}"),
| ^^^
|
= note: this message is not used as a format string when given without arguments, but will be in Rust 2021
= note: `#[warn(non_fmt_panics)]` on by default
help: add the missing argument
|
2260 | Err(e) => panic!("tokens failed to deserialize: {e}", ...),
| +++++
help: or add a "{}" format string to use the message literally
|
2260 | Err(e) => panic!("{}", "tokens failed to deserialize: {e}"),
| +++++
Serde

Serde is a framework for serializing and deserializing Rust data structures efficiently and generically.
You may be looking for:
- An overview of Serde
- Data formats supported by Serde
- Setting up
#[derive(Serialize, Deserialize)] - Examples
- API documentation
- Release notes
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::{Serialize, Deserialize};
#[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.