Open Radar

 
Try running this function in a context that allows step-by-step debugging and inspect the value of “state” before and after the assignment of .Two. Aftwards, the debugger just shows:

state	MinimalCase.Goo	<invalid> (0x90)	<invalid> (0x90)

As near as I can tell, the enum value is in fact OK. It’s just that the debugger can’t display it.

Interestingly, the debugger’s choking on this enum seems to involve the .Three case; if you remove that from the enum definition, then the debugger shows .Two correctly.

import Foundation

func flubber()
{
    enum Goo {
        case One
        case Two(NSArray)
        case Three(NSArray)
    }
    
    var state = Goo.One
    state = .Two(NSArray())
}