rust-clippy/tests/ui/option_if_let_else.fixed

// run-rustfix
#![warn(clippy::option_if_let_else)]
#![allow(clippy::redundant_closure)]
#![allow(clippy::ref_option_ref)]

fn bad1(string: Option<&str>) -> (bool, &str) {
    string.map_or((false, "hello"), |x| (true, x))
}

fn else_if_option(string: Option<&str>) -> Option<(bool, &str)> {
    if string.is_none() {
        None
    } else { string.map_or(Some((false, "")), |x| Some((true, x))) }
}

fn unop_bad(string: &Option<&str>, mut num: Option<i32>) {
    let _ = string.map_or(0, |s| s.len());
    let _ = num.as_ref().map_or(&0, |s| s);
    let _ = num.as_mut().map_or(&mut 0, |s| {
        *s += 1;
        s
    });
    let _ = num.as_ref().map_or(&0, |s| s);
    let _ = num.map_or(0, |mut s| {
        s += 1;
        s
    });
    let _ = num.as_mut().map_or(&mut 0, |s| {
        *s += 1;
        s
    });
}

fn longer_body(arg: Option<u32>) -> u32 {
    arg.map_or(13, |x| {
        let y = x * x;
        y * y
    })
}

fn impure_else(arg: Option<i32>) {
    let side_effect = || {
        println!("return 1");
        1
    };
    let _ = arg.map_or_else(|| side_effect(), |x| x);
}

fn test_map_or_else(arg: Option<u32>) {
    let _ = arg.map_or_else(|| {
        let mut y = 1;
        y = (y + 2 / y) / 2;
        y = (y + 2 / y) / 2;
        y
    }, |x| x * x * x * x);
}

fn negative_tests(arg: Option<u32>) -> u32 {
    let _ = if let Some(13) = arg { "unlucky" } else { "lucky" };
    for _ in 0..10 {
        let _ = if let Some(x) = arg {
            x
        } else {
            continue;
        };
    }
    let _ = if let Some(x) = arg {
        return x;
    } else {
        5
    };
    7
}

fn main() {
    let optional = Some(5);
    let _ = optional.map_or(5, |x| x + 2);
    let _ = bad1(None);
    let _ = else_if_option(None);
    unop_bad(&None, None);
    let _ = longer_body(None);
    test_map_or_else(None);
    let _ = negative_tests(None);
    let _ = impure_else(None);
}