Example of how debug.traceback() works

traceback.lua

local function a()
	print(debug.traceback())
end

local function b()
	a()
end

local function c()
	b()
end

c()

--[[ Will output:

stack traceback:
	traceback.lua:2: in function 'a'
	traceback.lua:6: in function 'b'
	traceback.lua:10: in function 'c'
	traceback.lua:13: in main chunk
	[C]: ?
--]]