Open Radar

 
Summary:
In Swift, if you define a function that takes a variable number of arguments, it is not possible to pass those arguments (as an array) to another function with a variable number of arguments inside the body of the first function.

Steps to Reproduce:
1. Define a function that takes a variable number of arguments.
2. Define a second function that also takes a variable number of arguments.
3. Inside the body of the second function, call the first function by passing the calling functions own array of arguments to it.

Expected Results:
Swift recognizes that the items in the array of arguments being passed to function 1 are meant to be used as arguments to it.

Actual Results:
A compiler error is produced. “Could not find an overload for ‘__conversion’ that accepts the supplied arguments.”

Notes:
The code below demonstrates this problem:

func sumOf(numbers: Int...) -> Int {
	var sum = 0
	for number in numbers {
		sum += number
	}
	return sum
}
sumOf(42, 597, 12)

func averageOf(numbers: Int...) -> Float {
	let sum = sumOf(numbers)
	return Float(sum) / Float(numbers.count)
}

averageOf(42, 597, 12, 18)