problem line 23

Cargo.toml

[package]
name = "rust-json"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
reqwest = { version = "0.11", features = ["json"] }
tokio = { version = "1", features = ["full"] }

main.rs

use serde::{Deserialize, Serialize};
use std::env;

#[derive(Debug, Serialize, Deserialize)]
struct Todo {
  #[serde(rename = "userId")]
  user_id: i32,
  id: Option<i32>,
  title: String,
  completed: bool,
}

#[tokio::main]
async fn main() -> Result<(), reqwest::Error> {
  let args: Vec<String> = env::args().collect();

  if args.len() < 1 {
    println!("Missing parameter. Please run:");
    println!("    cargo run get");
    println!("    cargo run post");
    println!("    cargo run object");

    Ok(());
  }

  let command = args[1].clone();

  match command.as_str() {
    "get" => {
      let todos:Vec<Todo> = reqwest::Client::new()
        .get("https://jsonplaceholder.typicode.com/todos?userId=1")
        .send()
        .await?
        .json()
        .await?;

      println!("{:#?}", todos);
    },
    "post" => {
      let new_todo = Todo {
        user_id: 190,
        id: None,
        title: "this is just a test".to_owned(),
        completed: false,
      };

      let the_todo: Todo = reqwest::Client::new()
        .post("https://jsonplaceholder.typicode.com/todos")
        .json(&new_todo)
        .send()
        .await?
        .json()
        .await?;
      
      println!("{:#?}", the_todo);
    },
    "object" => {
      let todos: serde_json::Value = reqwest::Client::new()
        .post("https://jsonplaceholder.typicode.com/todos")
        .json(&serde_json::json!({
          "userId": 1,
          "title": "just another test".to_owned(),
          "completed": false,
        }))
        .send()
        .await?
        .json()
        .await?;

      println!("{:#?}", todos);
    },
    _ => {
      println!("something went wrong");
    }
  }

  Ok(())
}