/usr/share/lua/5.3/cqueues/notify.lua is in lua-cqueues 20161214-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/lua/5.3/cqueues/../../5.1/cqueues/notify.lua
/usr/share/lua/5.3/cqueues/../../5.1/cqueues/notify.lua