Can't extend extension added structs on swift

Question

I have CustomClass like so:

class CustomClass {
    let attribute: Int
}

In another file I've added it a StructureA via extension like so:

extension CustomClass {
    struct StructureA {
        let someData: Int
    }
}

In a third file, I'm attempting to extend my CustomClass.StructureA like this:

I don't get what's wrong about it. If I do the exact same implementation on the same file where I have the implementation of StructureA it works fine.

Any ideas on what I might be missing?

They support nested types, I just don't get why they're not extendable from another file — Lucas Pereira, Dec 11 '17 at 16:29
The code itself is sound, so it looks like an access control issue. This isn't a solution, but try `open class CustomClass`, and possibly `open extension CustomClass` — XmasRights, Dec 11 '17 at 16:31
Neither the extension nor the struct can be define as `open` ... — Lucas Pereira, Dec 11 '17 at 16:34
Yeah, apparently it is a bug... That's bummer.. Thanks @Hamish — Lucas Pereira, Dec 11 '17 at 16:36

Lucas Pereira · Accepted Answer · 2017-12-11T16:52:22.647

1

As mentioned by @Hamish, turns out it's a known bug:

https://bugs.swift.org/browse/SR-631

edited Dec 11 '17 at 16:52

answered Dec 11 '17 at 16:43

Lucas Pereira

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Can't extend extension added structs on swift

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