In luatex, function show_node_list() displays the nodes of a discretionary in a different order than pdftex. Is this intended? I'm especially missing the number of nodes of the replacement (in the example: 2). Example: \showboxbreadth=\maxdimen \showboxdepth=\maxdimen \tracingonline=1 \newbox\mybox \setbox\mybox=\hbox{\discretionary{aa}{bb}{cc}} \showbox\mybox \bye Output of luatex: .\discretionary replacing ..\tenrm c ..\tenrm c ..\tenrm a ..\tenrm a .|\tenrm b .|\tenrm b Output of pdftex: .\discretionary replacing 2 ..\tenrm a ..\tenrm a .|\tenrm b .|\tenrm b .\tenrm c .\tenrm c Ciao Andreas