Debugging crashes in deployed swift apps

Nice, yes I'm still on 4.2. Ok cool, in your swift 5 example the backtrace is output even without the signal handler. Does this mean on Swift 5 this handler is not required to get a backtrace?

I'll will file a bug report for sure!

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Unfortunately, it's only this particular error that will print the stack trace. A naked fatalError(...) or integer overflow still won't.