Auto-closure default should be permitted to be the result type

IDE: Visual Studio X/Fire
Version: (develop)
Target (If relevant): Island(OSX)
Apple Swift permits the default value for an @autoclosure argument to be a value of the auto-closure’s result type.

Expected Behavior:
Actual Behavior:
See below.

func autocloseString(x: @autoclosure () -> String = "") { } // E62 Type mismatch, cannot assign "String!" to "func () -> RemObjects.Elements.System.Island.String"

Thanks, logged as bugs://83692

bugs://83692 got closed with status fixed.