How to get traceback and error message from dead coroutine in lua

Using debug.traceback and some output of coroutine.resume

function coroutine.xpcall(co)
  local output = {coroutine.resume(co)}
  if output[1] == false then
    return false, output[2], debug.traceback(co)
  end
  return table.unpack(output)
end

function func()
  error("Crash")
end

local co = coroutine.create(func)    

print(coroutine.xpcall(co)) --Should print error message + the traceback