Throwing `@autoclosure`s

IDE: Visual Studio X/Fire
Version: (develop)_
Target (If relevant): OSX
Swift allows throwing @autoclosures, but silver claims that is an attempt to add a parameter.

Expected Behavior:
Actual Behavior:
see inline.

  extension Int {
	  public static func foo (rhs: @autoclosure () throws -> Int) // E517 "@autoclosure" can only be applied to delegate types without parameters
	   rethrows -> Int {
		  return try rhs()

Thanks, logged as bugs://83177

bugs://83177 got closed with status fixed.