MAPGEN/mcl_villages/buildings.lua
-> Only use is checked.  Safe.

MAPGEN/mcl_villages/utils.lua
-> Only indexed uses.  Safe.

MAPGEN/tsm_railcorridors/init.lua
-> Unchecked accesses.  Fixed.

MAPGEN/mcl_structures/init.lua
-> Unchecked access. Fixed.

MAPGEN/mcl_dungeons/init.lua
-> Unchecked accesses.  Fixed.

MAPGEN/mcl_mapgen_core/init.lua
-> All uses are checked.  Safe.