use std::cmp::PartialEq;

struct Struct {
    field: (),
}

impl PartialEq<()> for Struct {
    fn eq(&self, other: &()) -> bool {
        self.field == *other
    }
}

fn main() {
    let s = Struct { field: () };

    if s == () {
        println!("Yay")
    }
    {
        println!("Ney")
    }
}