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I use call() to safely run a Lua function.
If an error occurs during the call, I want to dump stacktrace and

Currently I'm using the following code.
Would anyone mind to help me improve it?

	local handler = function(errstr)
		local t = getinfo(2) or getinfo(3)
		local s = format("Lua error %s at %s%s", 
			errstr, t.currentline or '?', t.source or '?')
		mark_failed(%test, s)
	local code, msg = call(dispatch_command, 
		{cmd}, 'x', handler)

The best writing is rewriting. 
     -- E. B. White