SE-0253: Static callables

[dan-zheng]

Pure speculation: I don't think there are truly fundamental blockers to supporting static func (), but it would definitely require parser changes (and maybe hard complications).

The important question is: is func () is a good/desirable name for call-syntax delegate methods? () does match the syntax for function application, but I'm not convinced it's an ideal name in Swift.

A similar direction from the pitch thread is to name call-syntax delegate methods func self (or static func Self, the static is added by me in the code below):

@ebg

or using self / Self :

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

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Personally, I prefer call declarations and unnamed methods (e.g. call func _) over both func () and func self. I feel the latter are more confusing.