What does "class _NSZombie_OS_voucher" implement like ?, So and? I mean?
I got the following message in Xcode when I had both Address Sanitizer and Zombie Objects options in my schema diagnostic options and ran the project:
objc[656]: Class _NSZombie_OS_voucher is implemented in both ?? and ??. One of the two will be used. Which one is undefined.
I turned off Zombie objects and the above message disappeared, but it doesn't come back if I turn Zombie objects back on.
What does the message mean?
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