/usr/share/lua/5.2/tongue/codex.lua is in lua-tongue 0.8-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/lua/5.2/tongue/../../5.1/tongue/codex.lua
/usr/share/lua/5.2/tongue/../../5.1/tongue/codex.lua