chore: remove specialized method for Self::foo() trait call

[asterite]

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[asterite]

Closing because this breaks code like this, where self_type isn't a struct:

trait Foo {
    fn foo() -> Self {
        Self::bar()
    }

    fn bar() -> Self;
}

impl Foo for Field {
    fn bar() -> Self {
        1
    }
}

fn main() {
    let x: Field = Foo::foo();
}