rust-clippy/tests/ui/option_map_unit_fn_fixable.rs

#![warn(clippy::option_map_unit_fn)]
#![allow(unused)]
#![allow(clippy::uninlined_format_args, clippy::unnecessary_wraps)]

fn do_nothing<T>(_: T) {}

fn diverge<T>(_: T) -> ! {
    panic!()
}

fn plus_one(value: usize) -> usize {
    value + 1
}

fn option() -> Option<usize> {
    Some(10)
}

struct HasOption {
    field: Option<usize>,
}

impl HasOption {
    fn do_option_nothing(&self, value: usize) {}

    fn do_option_plus_one(&self, value: usize) -> usize {
        value + 1
    }
}
#[rustfmt::skip]
fn option_map_unit_fn() {
    let x = HasOption { field: Some(10) };

    x.field.map(plus_one);
    let _ : Option<()> = x.field.map(do_nothing);

    x.field.map(do_nothing);

    x.field.map(do_nothing);

    x.field.map(diverge);

    let captured = 10;
    if let Some(value) = x.field { do_nothing(value + captured) };
    let _ : Option<()> = x.field.map(|value| do_nothing(value + captured));

    x.field.map(|value| x.do_option_nothing(value + captured));

    x.field.map(|value| { x.do_option_plus_one(value + captured); });


    x.field.map(|value| do_nothing(value + captured));

    x.field.map(|value| { do_nothing(value + captured) });

    x.field.map(|value| { do_nothing(value + captured); });

    x.field.map(|value| { { do_nothing(value + captured); } });


    x.field.map(|value| diverge(value + captured));

    x.field.map(|value| { diverge(value + captured) });

    x.field.map(|value| { diverge(value + captured); });

    x.field.map(|value| { { diverge(value + captured); } });


    x.field.map(|value| plus_one(value + captured));
    x.field.map(|value| { plus_one(value + captured) });
    x.field.map(|value| { let y = plus_one(value + captured); });

    x.field.map(|value| { plus_one(value + captured); });

    x.field.map(|value| { { plus_one(value + captured); } });


    x.field.map(|ref value| { do_nothing(value + captured) });

    option().map(do_nothing);

    option().map(|value| println!("{:?}", value));
}

fn main() {}