Open Radar

 
Summary:
In Swift, it is a requirement that initializers call a superclass initializer before returning. However, NSProxy is documented as an abstract class, and provides no initializer to call. As such, it is impossible to subclass NSProxy and add an initializer.

Swift should allow adding an initializer on an NSProxy subclass, either by adding general support for abstract superclasses or by special-casing this one class.

Steps to Reproduce:
1. Create a new Swift playground
2. Add the following code:

import Foundation
class Proxy: NSProxy {
init() { }
}

3. Compile

Expected Results:
The class compiles successfully, since NSProxy provides no superclass initializer to call from Proxy.init()

Actual Results:
The compiler issues an error: "Super.init isn't called before returning from initializer"

Version:
Xcode 6.0.1 (6A317) / OS X 10.10 (14A361c)

Notes:
Adding the requested superclass call to Proxy.init() in the above example produces a different error: "'NSProxy' does not have a member named 'init'"