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Roberto Ierusalimschy wrote:
> The first argument cannot be nil. Because the first argument is an
> optional thread, and nil is not a thread, the function gets confused
> about what is what. The call without the nil gives a correct answer.

I did wonder about this, but since coroutine.running() returns nil when
in the main thread, I assumed it was all right... how do I find out what
the currently running thread is?

Is the correct invocation debug.traceback(message, level) if I'm not
specifying a thread, then? What if I don't want a message either?
debug.traceback(level) doesn't seem to do what I want.

(I have to say that leading optional arguments are extremely confusing.
It was only after reading your message here that I realised how they're
supposed to work --- previously I'd been passing in nil to indicate 'no
argument here'...)

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