/usr/share/lua/5.2/lxp/lom.lua is in lua-expat 1.3.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/lua/5.2/lxp/../../5.1/lxp/lom.lua
/usr/share/lua/5.2/lxp/../../5.1/lxp/lom.lua