Example on "Creating JSON by serializing data structures" doesn't work.

[tmp505]

Example:

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

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

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(())
}

error: ```
cannot find derive macro Serialize in this scope
--> src/main.rs:4:10
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^
|
note: `Serialize` is imported here, but it is only a trait, without a derive macro
--> src/main.rs:1:26
|
1 | use serde::{Deserialize, Serialize};
| ^^^^^^^^^

error: cannot find derive macro Deserialize in this scope
--> src/main.rs:4:21
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^^^
|
note: Deserialize is imported here, but it is only a trait, without a derive macro
--> src/main.rs:1:13
|
1 | use serde::{Deserialize, Serialize};
| ^^^^^^^^^^^

error[E0601]: main function not found in crate one
--> src/main.rs:24:2
|
24 | }
| ^ consider adding a main function to src/main.rs

error[E0277]: the trait bound Address: Serialize is not satisfied
--> src/main.rs:18:35
|
18 | let j = serde_json::to_string(&address)?;
| --------------------- ^^^^^^^^ the trait Serialize is not implemented for Address
| |
| required by a bound introduced by this call
|
= help: the following other types implement trait Serialize:
bool
char
isize
i8
i16
i32
i64
i128
and 131 others
note: required by a bound in serde_json::to_string
--> /home/lum/.cargo/registry/src/index.crates.io-6f17d22bba15001f/serde_json-1.0.117/src/ser.rs:2209:17
|
2207 | pub fn to_string(value: &T) -> Result
| --------- required by a bound in this function
2208 | where
2209 | T: ?Sized + Serialize,
| ^^^^^^^^^ required by this bound in to_string

Some errors have detailed explanations: E0277, E0601.
For more information about an error, try rustc --explain E0277.
error: could not compile one (bin "one") due to 4 previous errors