Partial application of struct method is not allowed

playground.swift

let names = ["karl", "marc", "john"]

struct SomeStruct {
    static func uppercase(name: String) -> String {
        return name.uppercaseString
    }
    
    func uppercase(name: String) -> String {
        return name.uppercaseString
    }
}

map(names, SomeStruct.uppercase)

let someStruct = SomeStruct()
map(names, SomeStruct.uppercase(someStruct))
map(names, someStruct.uppercase) // Partial application of struct method is not allowed

class SomeClass {
    static func uppercase(name: String) -> String {
        return name.uppercaseString
    }
    
    func uppercase(name: String) -> String {
       return name.uppercaseString
    }
}

map(names, SomeClass.uppercase)

let someClass = SomeClass()
map(names, someClass.uppercase)
map(names, SomeClass.uppercase(someClass))