main()1fn main() { 2 1 + Some(1); //~ ERROR cannot add `Option<{integer}>` to `{integer}` 3 2 as usize - Some(1); //~ ERROR cannot subtract `Option<{integer}>` from `usize` 4 3 * (); //~ ERROR cannot multiply `{integer}` by `()` 5 4 / ""; //~ ERROR cannot divide `{integer}` by `&str` 6 5 < String::new(); //~ ERROR can't compare `{integer}` with `String` 7 6 == Ok(1); //~ ERROR can't compare `{integer}` with `Result<{integer}, _>` 8 } 9