Pitch: Introduce (static) callables

Evolution Pitches
14

I feel like this increases the surface area of learning Swift quite heavily, as it's likely to become a (ab)used feature for aesthetic reasons. Maybe I'm just not used to it, but it seems to make following code difficult with a special-case syntax.

Does it actually need a new keyword call rather than just allowing unnamed functions?

struct Adder {
    var base: Int
    func(_ x: Int) -> Int {
        return base + x
    }
}

or using self / Self:

struct Adder {
    var base: Int
    func self(_ x: Int) -> Int { // instance method
        return base + x
    }
    func Self(_ x: Int) -> Int { // class method
        return base + x
    }
}
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