Link error will be occurred if a Swift class inherits NSObject with single case enum typed property.

main.swift

import Foundation

enum E {
    case A
    //, B
}

class C//: NSObject
{
    var e: E

    init(e: E) {
        self.e = e
    }
}

var c = C(e:.A)

// Link error will be occurred if C inherits NSObject
// with single case enum variable.

// Undefined symbols for architecture x86_64:
//   "__TWvdvC3Foo1C1eOS_1E", referenced from:
//       __TFC3Foo1Cm1eOS_1E in main.o
// ld: symbol(s) not found for architecture x86_64
// clang: error: linker command failed with exit code 1 (use -v to see invocation)

Apple tells me that this bug is fixed on Xcode 6.3 beta with Swift 1.2. I checked it and confirmed this issue is resolved.