Obscure bug with > overloading with UIKit under iOS

gistfile1.swift

// This code fails to compile with iOS SDK 8.1 and Xcode 6.1
import UIKit

let names = ["a","c","b"]

// This fails to compile on iOS targets
// It works if:
// a) you add "return" to the closure 
//   - or -
// b) you remove the UIKit import
var reversed = sorted(names) { $0 > $1 }

println(reversed)

Notes:

• Using < operator works fine
• It seems impossible to find out where the declaration of ">" is coming from and hence what is wrong. Can Xcode help us solve problems like this or not?

I think the problem is that there are declarations for:

func <(lhs: UnicodeScalar, rhs: UnicodeScalar) -> Bool
func <(lhs: UInt, rhs: UInt) -> Bool
func <(lhs: String.Index, rhs: String.Index) -> Bool
func <(lhs: String, rhs: String) -> Bool

...but no such overrides declared for >

Although this doesn't make sense to me, how adding "return" can fix the problem.