rust-clippy/tests/ui/single_char_add_str.fixed

#![warn(clippy::single_char_add_str)]
#![allow(clippy::needless_raw_strings, clippy::needless_raw_string_hashes)]

macro_rules! get_string {
    () => {
        String::from("Hello world!")
    };
}

fn main() {
    // `push_str` tests

    let mut string = String::new();
    string.push('R');
    string.push('\'');

    string.push('u');
    string.push_str("st");
    string.push_str("");
    string.push('\x52');
    string.push('\u{0052}');
    string.push('a');

    let c_ref = &'a';
    string.push(*c_ref);
    let c = 'a';
    string.push(c);
    string.push('a');

    get_string!().push('ö');

    // `insert_str` tests

    let mut string = String::new();
    string.insert(0, 'R');
    string.insert(1, '\'');

    string.insert(0, 'u');
    string.insert_str(2, "st");
    string.insert_str(0, "");
    string.insert(0, '\x52');
    string.insert(0, '\u{0052}');
    let x: usize = 2;
    string.insert(x, 'a');
    const Y: usize = 1;
    string.insert(Y, 'a');
    string.insert(Y, '"');
    string.insert(Y, '\'');

    string.insert(0, *c_ref);
    string.insert(0, c);
    string.insert(0, 'a');

    get_string!().insert(1, '?');
}