Xcode 7.3: app委托不能访问它自己的对象，context声称捕获了一个objective-C对象，但是self是不可用的。

In xcode 7.3 on MacOS 10.11.3 and 10.11.4, when I stop the debugger inside any app delegate method and try to examine any object instantiated inside the app delegate, or even the app delegate itself, I get this warning in the debugger:In xcode 7.3 on MacOS 10.11.3 and 10.11.4, when