function f (...)
  local arg=...

  local a,b = arg[1], arg[2]

  return {a + b, "jim"}
end

status, ret, err = xpcall (f, debug.traceback, {1,5})

print ("status", status)
print ("ret", ret)
print ("err", err)

--[[
status	true
ret	table: 0x420650
err	nil
]]--




-- ERROR EXAMPLE


function f (...)
  local arg=...

  local a,b = arg[1], arg[2]

  return {a + "b", "jim"}
end

status, ret, err = xpcall (f, debug.traceback, {1,5})

print ("status", status)
print ("ret", ret)
print ("err", err)

--[[
status	false
ret	/Users/jamesfolk/Documents/lua_scratch_pad/main.lua:23: attempt to perform arithmetic on a string value
stack traceback:
	/Users/jamesfolk/Documents/lua_scratch_pad/main.lua:23: in function 'f'
	[C]: in function 'xpcall'
	/Users/jamesfolk/Documents/lua_scratch_pad/main.lua:26: in function </Users/jamesfolk/Documents/lua_scratch_pad/main.lua:1>
	/Users/jamesfolk/Documents/lua_scratch_pad/main.lua:1: in main chunk
err	nil
]]--