#![allow(clippy::single_char_pattern)]

struct Issue12068;

impl AsRef<str> for Issue12068 {
    fn as_ref(&self) -> &str {
        ""
    }
}

impl ToString for Issue12068 {
    fn to_string(&self) -> String {
        String::new()
    }
}

fn main() {
    let _ = "a".split('a').next().unwrap();
    //~^ ERROR: unnecessary use of `to_string`
    let _ = "a".split("a").next().unwrap();
    //~^ ERROR: unnecessary use of `to_string`
    let _ = "a".split('a').next().unwrap();
    //~^ ERROR: unnecessary use of `to_owned`
    let _ = "a".split("a").next().unwrap();
    //~^ ERROR: unnecessary use of `to_owned`
    let _ = Issue12068.as_ref().split('a').next().unwrap();
    //~^ ERROR: unnecessary use of `to_string`

    let _ = [1].split(|x| *x == 2).next().unwrap();
    //~^ ERROR: unnecessary use of `to_vec`
    let _ = [1].split(|x| *x == 2).next().unwrap();
    //~^ ERROR: unnecessary use of `to_vec`
    let _ = [1].split(|x| *x == 2).next().unwrap();
    //~^ ERROR: unnecessary use of `to_owned`
    let _ = [1].split(|x| *x == 2).next().unwrap();
    //~^ ERROR: unnecessary use of `to_owned`
}