Collection extension not visible when called within same extension?

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I am using the following extension on Collection:

extension Collection where Indices.Iterator.Element == Index {

    subscript (safe index: Index) -> Generator.Element? {
        return indices.contains(index) ? self[index] : nil
    }

}

I want to then use it in a function found in another Collection extension like this:

extension Collection {

    func tesFunc() -> String? {

        let s = [safe:1]

        return nil
    }
}

I am not able to make this work. The error I get is: "Use of unresolved identifier 'safe'

How can use the save subscript in the function found on the second extension on Collection?

asked 18 secs ago

zumzum

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Collection extension not visible when called within same extension?