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Summary:
When overriding an extension in an iOS Playground, it causes a EXC_BAD_INSTRUCTION when instantiating an instance.  For example,  

import Cocoa
import Foundation

class Base { }

extension Base {
  @objc var foo: String { return "foo" }
}

class Sub: Base {
  override var foo: String { return "FOO" } // This no longer errors
}

var object = Sub()
object.foo

However, this issue doesn't happen in a OS X Playground.  Next, I'm including the Playgrounds for both iOS and OS X for review.

Steps to Reproduce:
Please see the iOS Playground attachment.

Expected Results:
I would expect that it would exhibit similar behavior as the OS X Playground example.

Actual Results:
The iOS Playground generates a bad instruction error.

Version:
Xcode 6.1.1/6A2008a & OS X 10.10.1/14B25

Notes:


Configuration:


Attachments:
'overriding-extensions-ios.playground.zip' and 'overriding-extensions-osx.playground.zip' were successfully uploaded.