4 #[deny(option_unwrap_used, result_unwrap_used)]
5 #[deny(str_to_string, string_to_string)]
8 let _ = opt.unwrap(); //~ERROR used unwrap() on an Option
10 let res: Result<i32, ()> = Ok(0);
11 let _ = res.unwrap(); //~ERROR used unwrap() on a Result
13 let string = "str".to_string(); //~ERROR `str.to_owned()` is faster
14 let _again = string.to_string(); //~ERROR `String.to_string()` is a no-op