Fatal access conflict detected.

Fatal access conflict detected.

Solution:
http://michael-brown.net/2017/swift-and-kvo-context-variables/
Swift and KVO context variables

SWIFT 4.0 的检测显然又严了一些,糟糕的是有些检测无法在编译阶段进行,到运行时发现不符合SWIFT 4的要求,一切都为时已晚了,只能crash

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