[swift-users] How self automatically becomes Self type if the function's return type is Self?

[Zhao Xin]

See the code:

protocol Foo {

    func instance() -> Self

}


class Bar: Foo {

    func instance() -> Self {

        return self // Declaration: let `self`: Self

    }

    func other() {

        let i = self // Declaration: let `self`: Bar

    }

}

How does it happen?


Zhaoxin
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