SwiftOverloads

//: Playground - noun: a place where people can play

import Foundation

func work<R, T0>(_ f: @escaping (T0) -> R) -> (T0) -> R {
    return { (arg0: T0) -> R in return f(arg0) }
}

func work<R, T0, T1>(_ f: @escaping (T0, T1) -> R) -> (T0, T1) -> R {
    return { (arg0: T0, arg1: T1) -> R in return f(arg0, arg1) }
}

func test1(_ arg0: Int) -> Int { return arg0 }
func test2(_ arg0: Int, arg1: Int) -> Int { return arg0 + arg1 }

let a = work(test1)
let b = work(test2) // error: SwiftOverloads.playground:11:9: error: ambiguous use of 'work'

Works with labels, but ...

import Foundation

func work<R, T0>(f1: @escaping (T0) -> R) -> (T0) -> R {
    return { (arg0: T0) -> R in return f1(arg0) }
}

func work<R, T0, T1>(f2: @escaping (T0, T1) -> R) -> (T0, T1) -> R {
    return { (arg0: T0, arg1: T1) -> R in return f2(arg0, arg1) }
}

func test1(_ arg0: Int) -> Int { return arg0 }
func test2(_ arg0: Int, arg1: Int) -> Int { return arg0 + arg1 }

let a = work(f1: test1)
let b = work(f2: test2)