module('luatexja.stack', package.seeall)
local err, warn, info, log = luatexbase.errwarinf(_NAME)
-require('luatexja.base'); local ltjb = luatexja.base
+luatexja.load_module('base'); local ltjb = luatexja.base
local node_new = node.new
local id_whatsit = node.id('whatsit')