I'm trying to make a program that adds a user's input and adds 2 to it, don't understand errors

Question

use std::io; 

fn main() {
    let mut number_to_add = String::new();
    
    println!("what do you wanna add to two");

    io::stdin()
        .read_line(&mut number_to_add);

    let number_to_add: u32 = number_to_add.trim().parse();  {
        Ok(num) => num,
        Err() => continue,
    };

    let mut result = 2 + number_to_add;

    println!("result is {}", result);
}

Here is the error output:

error: expected one of `.`, `;`, `?`, `}`, or an operator, found `=>`
  --> src/main.rs:12:17
   |
12 |         Ok(num) => num,
   |                 ^^ expected one of `.`, `;`, `?`, `}`, or an operator

error[E0308]: mismatched types
  --> src/main.rs:11:30
   |
11 |     let number_to_add: u32 = number_to_add.trim().parse();  {
   |                        ---   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `u32`, found enum `Result`
   |                        |
   |                        expected due to this
   |
   = note: expected type `u32`
              found enum `Result<_, _>`

For more information about this error, try `rustc --explain E0308`.
error: could not compile `mather` due to 2 previous errors

Before I get asked, yes, I have read the explanation with rustc and I do not understand it. I know that it's probably expecting a number, but aren't the .trim() and .parse() supposed to turn the user inputted string into a number?