implementing PartialEq for a trait object. Another approach

partialeq_trait_take2.rs

trait Schema {
    fn eq(&self, other: &Schema) -> bool;
}

impl<'a> PartialEq<&'a Schema> for &'a Schema {
    fn eq(&self, other: &&Schema) -> bool {
        Schema::eq(*self, *other)
    }
}

struct Foo;

impl Schema for Foo {
    fn eq(&self, _other: &Schema) -> bool { true }
}

fn main() {
    let foo1 = Foo;
    let foo2 = Foo;
    if &foo1 as &Schema == &foo2 as &Schema {
        println!("Hello, world!");
    }
}

from
https://users.rust-lang.org/t/testing-equality-with-a-trait-object/5034
author
withoutboats

unfortunately this does not work well with #derive(PartialEq) :(