Self

mains.rs

struct Foo {
    bar: i32
}

impl Foo {
    fn instead_of_this() -> Foo {
        Foo { bar: 0 }
    }

    fn you_can_use_this() -> Self {
        Self { bar: 0 }
    }
}

fn main() {
    let a = Foo::instead_of_this();
    let b = Foo::you_can_use_this();
    assert_eq!(a.bar, b.bar);
}