Parsing Escaped Quotes in Serde

library(stringr)

use serde::Deserialize;
use std::borrow::Cow;

#[derive(Deserialize, Debug)]
struct Comment<'a> {
    id: u32,
    text: Cow<'a, str>,
}

fn main() {
    let data: Vec<Comment> = serde_json::from_str(
        r#"
            [
                {
                    "id": 345213,
                    "text": "Hello world!"
                },
                {
                    "id": 2412345,
                    "text": "This is a double quote: \""
                }
            ]
        "#,
    )
    .unwrap();
    println!(
        "{}",
        data[1].text //.iter().map(|entry| entry.id).collect::<Vec<_>>()
    );
}

The problem is that this deserilise into a borrowed string, then the lifetime of that borrowed string is tied to the input of the JSON string, and moreover, presumably must correspond to a substring of the original JSON. Since this JSON string contains escape sequences, that isn’t possible. e.g. A "hell\"lo" in a JSON string should actually deserialise to hel"lo in Rust &str, but this is not a substring of “hel”, so it doesn’t work. It can be fixed by using a Cow<’a, str> instead.

use serde::Deserialize;

#[derive(Deserialize, Debug)]
struct Comment<'a> {
    id: u32,
    text: &'a str,
}

fn main() {
    let data: Vec<Comment> =
        serde_json::from_str(r#"[{"id": 345213,"text": "Hello world!"}]"#).unwrap();
    println!("{:?}", data);
}

## [Comment { id: 345213, text: "Hello world!" }]

# generic, he, message=TRUE, warning=TRUE, command="gcc {}.c -o {} && ./{}"
#include <stdio.h>
int main(void)
{
    printf("Hello world!\n");
    printf("The value of a is %d\n", a());

    return 0;
}

int a(void)
{
    return 1;
}