Re[2]: getting call stack in case of a run-time error

[Tomas <tomas@...>]

	Hi Dmitriy,

> I tried it after run-time error inside a lua thread. Now
	I'm sorry.  I forgot to mention that you to use it inside
a "xpcall".  For instance, supose you want to call function x
with a set of different arguments:

function x (s)
    return '('..s..')'
end

for _, s in ipairs{ "abc", 23, {} } do
    local ok, msg_or_str = xpcall (function () return x(s) end, debug.traceback)
    if ok then
        print ("Ok!", msg_or_str)
    else
        print ("Fail!", msg_or_str)
    end
end

	The arguments are on the table { "abc", 23, {} }.

Ok!     (abc)
Ok!     (23)
Fail!   test.lua:2: attempt to concatenate local `s' (a table value)
stack traceback:
        test.lua:2: in function `x'
        (tail call): ?
        [C]: in function `xpcall'
        test.lua:6: in main chunk
        [C]: ?

	The error message was created by debug.traceback and returned
by xpcall as the second return value.  `test.lua` is the name of the
file where the code was written.
		Tomas