tests/ui/unnecessary_owned_empty_strings.rs

#![warn(clippy::unnecessary_owned_empty_strings)]

fn ref_str_argument(_value: &str) {}

#[allow(clippy::ptr_arg)]
fn ref_string_argument(_value: &String) {}

fn main() {
    // should be linted
    ref_str_argument(&String::new());
    //~^ unnecessary_owned_empty_strings

    // should be linted
    #[allow(clippy::manual_string_new)]
    ref_str_argument(&String::from(""));
    //~^ unnecessary_owned_empty_strings

    // should not be linted
    ref_str_argument("");

    // should not be linted
    ref_string_argument(&String::new());
}