Json: cannot find derive macros and error[E0277]

[jaredforth]

I am running the Creating JSON by serializing data structures example code from README.md exactly as written in the documentation, with the exception of a main() function that calls print_an_address():

main.rs:

use serde::{Deserialize, Serialize};
use serde_json::Result;

#[derive(Serialize, Deserialize)]
struct Address {
    street: String,
    city: String,
}

fn main() {
    print_an_address();
}

fn print_an_address() -> Result<()> {
    // Some data structure.
    let address = Address {
        street: "10 Downing Street".to_owned(),
        city: "London".to_owned(),
    };

    // Serialize it to a JSON string.
    let j = serde_json::to_string(&address)?;

    // Print, write to a file, or send to an HTTP server.
    println!("{}", j);

    Ok(())
}

When this code runs, the following errors are logged:

error: cannot find derive macro Serialize in this scope
--> src/main.rs:4:10
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^

error: cannot find derive macro Deserialize in this scope
--> src/main.rs:4:21
|
4 | #[derive(Serialize, Deserialize)]

error[E0277]: the trait bound Address: serde::ser::Serialize is not satisfied
--> src/main.rs:22:13
|
22 | let j = serde_json::to_string(&address)?;
| ^^^^^^^^^^^^^^^^^^^^^ the trait serde::ser::Serialize is not implemented for Address
|
= note: required by serde_json::ser::to_string

Cargo.toml:

[dependencies]
serde = "1.0.100"
serde_json = "1.0.40"

[jaredforth]

This is resolved by explicitly including the derive feature in Cargo.toml:

[dependencies]
serde = { version = "1.0.100", features = ["derive"] }
serde_json = "1.0.40"

[GregWoods]

This looks like a documentation defect

[jaredforth]

@GregWoods Yes, the documentation should probably specify that the "derive" feature needs to be explicitly specified.

[saebs]

Documentation still needs to be corrected, faced the very same problem. its 2020 now