Simple attempt to fetch understanding on match/return of error

match + return error

// https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=ceaf3827dea9f6a51fa9ecac48876652

#![allow(unused)]
fn main() {

  fn say_hello(str: &str) -> Result<(), &str> {
    match str {
        "abc" => println!("this is abc!"),
        "error" => return Err("this is error!"),
        something_else => println!("{}", something_else)
    }
    Ok(())
  }
  
  say_hello("abc");
  say_hello("error").unwrap();
}