fn main() {
    // Try to pass the result of `chain_ref` into `consume_move`.
    consume_move(Foo::default().chain_ref().chain_ref());

    // NOTE: You can pass the result of `chain_move` to `consume_ref`, but you
    // can't pass the result of `chain_ref` to `consume_move`.
    consume_ref(&Foo::default().chain_move().chain_move());
    // consume_move(Foo::default().chain_ref().chain_ref()); // Doesn't compile.
}

// ============================================================================
// Shared definitions.
// ============================================================================

#[derive(Debug, Default)]
struct Foo {
    value: usize,
}

impl Foo {
    fn chain_move(mut self) -> Self {
        self.value += 1;
        self
    }

    fn chain_ref(&mut self) -> &mut Self {
        self.value += 1;
        self
    }
}

fn consume_move(foo: Foo) {
    println!("{:?}", foo);
}

fn consume_ref(foo: &Foo) {
    println!("{:?}", foo);
}