src/tools/clippy/tests/ui/option_zip_none.fixed

#![warn(clippy::option_zip_none)]
#![allow(clippy::needless_borrow)]
mod edge_case {
    trait MyZip {
        fn zip(self, other: Option<()>) -> &'static str;
    }

    impl<T> MyZip for &Option<T> {
        fn zip(self, _other: Option<()>) -> &'static str {
            "not Option::zip"
        }
    }

    pub fn test_custom_trait() {
        let opt = Some(1);
        let _ = (&opt).zip(None::<()>);
    }

    enum MyOption {
        Some(i32),
        None,
    }

    impl MyOption {
        fn zip(self, _other: Option<()>) -> &'static str {
            "not Option::zip"
        }
    }

    pub fn test_custom_enum() {
        let opt = MyOption::Some(1);
        let _ = opt.zip(None::<()>);
    }
}

fn main() {
    let opt = Some(5);

    let _ = opt.map(|n| (n, None::<()>));
    //~^ option_zip_none

    let _ = opt.zip(Some(42));

    let iter = vec![1, 2, 3].into_iter();
    let _ = iter.zip(std::iter::empty::<i32>());

    let standard_opt = Some(1);
    let _ = (&standard_opt).map(|n| (n, None::<()>));
    //~^ option_zip_none

    let _ = Some(1).map(|n| (None::<i32>, n));
    //~^ option_zip_none

    let _ = Some(1).map(|n| (n, None::<()>));
    //~^ option_zip_none

    macro_rules! macro_none {
        () => {
            None::<()>
        };
    }
    let opt = Some(1);
    let _ = opt.map(|n| (n, macro_none!()));
    //~^ option_zip_none

    macro_rules! macro_zip {
        ($opt:expr) => {
            $opt.zip(None::<()>)
        };
    }
    let _ = macro_zip!(Some(1));
    macro_rules! macro_zip_arg {
        ($opt:expr, $arg:expr) => {
            $opt.zip($arg)
        };
    }
    let _ = macro_zip_arg!(Some(1), None::<()>);
}