// run-rustfix

#![warn(clippy::all)]
#![warn(clippy::redundant_pattern_matching)]
#![allow(clippy::unit_arg, clippy::let_unit_value, unused_must_use)]

fn main() {
    Ok::<i32, i32>(42).is_ok();

    Err::<i32, i32>(42).is_err();

    None::<()>.is_none();

    Some(42).is_some();

    if Ok::<i32, i32>(42).is_ok() {}

    if Err::<i32, i32>(42).is_err() {}

    if None::<i32>.is_none() {}

    if Some(42).is_some() {}

    if let Ok(x) = Ok::<i32, i32>(42) {
        println!("{}", x);
    }

    Ok::<i32, i32>(42).is_ok();

    Ok::<i32, i32>(42).is_err();

    Err::<i32, i32>(42).is_err();

    Err::<i32, i32>(42).is_ok();

    Some(42).is_some();

    None::<()>.is_none();

    let _ = None::<()>.is_none();

    let _ = Ok::<usize, ()>(4).is_ok();

    let _ = does_something();
    let _ = returns_unit();

    let opt = Some(false);
    let x = opt.is_some();
    takes_bool(x);
}

fn takes_bool(_: bool) {}

fn does_something() -> bool {
    Ok::<i32, i32>(4).is_ok()
}

fn returns_unit() {
    Ok::<i32, i32>(4).is_ok();
}