[swift-evolution] [Pitch] Introduce user-defined dynamically "callable" types

[Tino Heth]

> Example Usage
> 

Swift is quite flexible on what can act as a closure — would it be allowed to use a dynamic callable in that context?
I guess forwarding of

let closure: ([(String, Int)]) -> Int  = DynamicCallableType()

to the dynamicCall method of DynamicCallableType isn’t that hard, but wouldn’t it be odd if the value of closure changes when you leave out its type?
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