Merge pull request 'Fix potential crashes due to unregistered nodes.' (#2055) from fix-unregistered-nodes into master

Reviewed-on: MineClone2/MineClone2#2055
Reviewed-by: cora <cora@noreply.git.minetest.land>

mods/ENTITIES/mcl_item_entity/init.lua

@@ -256,6 +256,8 @@ function minetest.handle_node_drops(pos, drops, digger)
 
 	local silk_touch_drop = false
 	local nodedef = minetest.registered_nodes[dug_node.name]
+	if not nodedef then return end
+
 	if shearsy_level and shearsy_level > 0 and nodedef._mcl_shears_drop then
 		if nodedef._mcl_shears_drop == true then
 			drops = { dug_node.name }

mods/ENTITIES/mcl_minecarts/init.lua

@@ -432,7 +432,8 @@ local function register_entity(entity_id, mesh, textures, drop, on_rightclick, o
 			-- Slow down or speed up
 			local acc = dir.y * -1.8
 			local friction = 0.4
-			local speed_mod = minetest.registered_nodes[minetest.get_node(pos).name]._rail_acceleration
+			local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
+			local speed_mod = ndef and ndef._rail_acceleration
 
 			acc = acc - friction
 
@@ -860,4 +861,4 @@ if has_mcl_wip then
 	mcl_wip.register_wip_item("mcl_minecarts:furnace_minecart")
 	mcl_wip.register_wip_item("mcl_minecarts:command_block_minecart")
 	mcl_wip.register_wip_item("mcl_minecarts:hopper_minecart")
-end
+end

mods/ENTITIES/mcl_mobs/api.lua

@@ -1328,8 +1328,8 @@ local do_jump = function(self)
 		return false
 	end
 
-	if self.walk_chance == 0
+	local ndef = minetest.registered_nodes[nod.name]
-	or minetest.registered_items[nod.name].walkable then
+	if self.walk_chance == 0 or ndef and ndef.walkable then
 
 		if minetest.get_item_group(nod.name, "fence") == 0
 		and minetest.get_item_group(nod.name, "fence_gate") == 0

mods/ENTITIES/mobs_mc/3_shared.lua

@@ -50,8 +50,10 @@ mobs_mc.make_owner_teleport_function = function(dist, teleport_check_interval)
 					local telepos_below = {x=telepos.x, y=telepos.y-1, z=telepos.z}
 					table.remove(check_offsets, r)
 					-- Long story short, spawn on a platform
-					if minetest.registered_nodes[minetest.get_node(telepos).name].walkable == false and
+					local trynode = minetest.registered_nodes[minetest.get_node(telepos).name]
-							minetest.registered_nodes[minetest.get_node(telepos_below).name].walkable == true then
+					local trybelownode = minetest.registered_nodes[minetest.get_node(telepos_below).name]
+					if trynode and not trynode.walkable and
+							trybelownode and trybelownode.walkable then
 						-- Correct position found! Let's teleport.
 						self.object:set_pos(telepos)
 						return

mods/ENTITIES/mobs_mc/blaze.lua

@@ -189,9 +189,10 @@ mobs:register_arrow("mobs_mc:blaze_fireball", {
 			local v = vector.normalize(self.object:get_velocity())
 			local crashpos = vector.subtract(pos, v)
 			local crashnode = minetest.get_node(crashpos)
+			local cndef = minetest.registered_nodes[crashnode.name]
 			-- Set fire if node is air, or a replacable flammable node (e.g. a plant)
 			if crashnode.name == "air" or
-					(minetest.registered_nodes[crashnode.name].buildable_to and minetest.get_item_group(crashnode.name, "flammable") >= 1) then
+					(cndef and cndef.buildable_to and minetest.get_item_group(crashnode.name, "flammable") >= 1) then
 				minetest.set_node(crashpos, {name = mobs_mc.items.fire})
 			end
 		end

mods/ENTITIES/mobs_mc/enderman.lua

@@ -478,7 +478,8 @@ mobs:register_mob("mobs_mc:enderman", {
 						-- Selected node needs to have 3 nodes of free space above
 						for u=1, 3 do
 							local node = minetest.get_node({x=nodepos.x, y=nodepos.y+u, z=nodepos.z})
-							if minetest.registered_nodes[node.name].walkable then
+							local ndef = minetest.registered_nodes[node.name]
+							if ndef and ndef.walkable then
 								node_ok = false
 								break
 							end
@@ -512,7 +513,8 @@ mobs:register_mob("mobs_mc:enderman", {
 							node_ok = true
 							for u=1, 3 do
 								local node = minetest.get_node({x=nodepos.x, y=nodepos.y+u, z=nodepos.z})
-								if minetest.registered_nodes[node.name].walkable then
+								local ndef = minetest.registered_nodes[node.name]
+								if ndef and ndef.walkable then
 									node_ok = false
 									break
 								end

mods/ENTITIES/mobs_mc/slime+magma_cube.lua

@@ -16,7 +16,8 @@ local spawn_children_on_die = function(child_mob, children_count, spawn_distance
 		if not eject_speed then
 			eject_speed = 1
 		end
-		local mother_stuck = minetest.registered_nodes[minetest.get_node(pos).name].walkable
+		local mndef = minetest.registered_nodes[minetest.get_node(pos).name]
+		local mother_stuck = mndef and mndef.walkable
 		angle = math.random(0, math.pi*2)
 		local children = {}
 		for i=1,children_count do
@@ -26,7 +27,8 @@ local spawn_children_on_die = function(child_mob, children_count, spawn_distance
 			-- If child would end up in a wall, use position of the "mother", unless
 			-- the "mother" was stuck as well
 			local speed_penalty = 1
-			if (not mother_stuck) and minetest.registered_nodes[minetest.get_node(newpos).name].walkable then
+			local cndef = minetest.registered_nodes[minetest.get_node(newpos).name]
+			if (not mother_stuck) and cndef and cndef.walkable then
 				newpos = pos
 				speed_penalty = 0.5
 			end

mods/ITEMS/mcl_core/functions.lua

@@ -210,7 +210,8 @@ minetest.register_abm({
 		end
 		local posses = { { 1, 0 }, { -1, 0 }, { 0, 1 }, { 0, -1 } }
 		for _, p in pairs(posses) do
-			if minetest.registered_nodes[minetest.get_node(vector.new(pos.x + p[1], pos.y, pos.z + p[2])).name].walkable then
+			local ndef = minetest.registered_nodes[minetest.get_node(vector.new(pos.x + p[1], pos.y, pos.z + p[2])).name]
+			if ndef and ndef.walkable then
 				local posy = pos.y
 				while minetest.get_node(vector.new(pos.x, posy, pos.z)).name == "mcl_core:cactus" do
 					local pos = vector.new(pos.x, posy, pos.z)
@@ -841,7 +842,7 @@ minetest.register_abm({
 			-- If this was mycelium, uproot plant above
 			if n2.name == "mcl_core:mycelium" then
 				local tad = minetest.registered_nodes[minetest.get_node(above).name]
-				if tad.groups and tad.groups.non_mycelium_plant then
+				if tad and tad.groups and tad.groups.non_mycelium_plant then
 					minetest.dig_node(above)
 				end
 			end
@@ -1333,7 +1334,7 @@ minetest.register_abm({
 function mcl_core.supports_vines(nodename)
 	local def = minetest.registered_nodes[nodename]
 	-- Rules: 1) walkable 2) full cube
-	return def.walkable and
+	return def and def.walkable and
 			(def.node_box == nil or def.node_box.type == "regular") and
 			(def.collision_box == nil or def.collision_box.type == "regular")
 end

mods/MAPGEN/mcl_dungeons/init.lua

@@ -134,10 +134,15 @@ local function ecb_spawn_dungeon(blockpos, action, calls_remaining, param)
 	-- Check floor and ceiling: Must be *completely* solid
 	local y_floor = y
 	local y_ceiling = y + dim.y + 1
-	if check then for tx = x+1, x+dim.x do for tz = z+1, z+dim.z do
+	if check then
-		if not registered_nodes[get_node({x = tx, y = y_floor  , z = tz}).name].walkable
+		for tx = x+1, x+dim.x do
-		or not registered_nodes[get_node({x = tx, y = y_ceiling, z = tz}).name].walkable then return false end
+		for tz = z+1, z+dim.z do
-	end end end
+			local fdef = registered_nodes[get_node({x = tx, y = y_floor  , z = tz}).name]
+			local cdef = registered_nodes[get_node({x = tx, y = y_ceiling, z = tz}).name]
+			if not fdef or not fdef.walkable or not cdef or not cdef.walkable then return false end
+		end
+		end
+	end
 
 	-- Check for air openings (2 stacked air at ground level) in wall positions
 	local openings_counter = 0
@@ -287,7 +292,8 @@ local function ecb_spawn_dungeon(blockpos, action, calls_remaining, param)
 		-- Do not overwrite nodes with is_ground_content == false (e.g. bedrock)
 		-- Exceptions: cobblestone and mossy cobblestone so neighborings dungeons nicely connect to each other
 		local name = get_node(p).name
-		if registered_nodes[name].is_ground_content or name == "mcl_core:cobble" or name == "mcl_core:mossycobble" then
+		local rn = registered_nodes[name]
+		if rn and rn.is_ground_content or name == "mcl_core:cobble" or name == "mcl_core:mossycobble" then
 			-- Floor
 			if ty == y then
 				if pr:next(1,4) == 1 then

mods/MAPGEN/mcl_structures/init.lua

@@ -179,7 +179,7 @@ function mcl_structures.generate_igloo(pos, rotation, pr)
 			real_depth = real_depth + 1
 			local node = minetest.get_node({x=tpos.x,y=tpos.y-y,z=tpos.z})
 			local def = minetest.registered_nodes[node.name]
-			if (not def) or (not def.walkable) or (def.liquidtype ~= "none") or (not def.is_ground_content) then
+			if not (def and def.walkable and def.liquidtype == "none" and def.is_ground_content) then
 				bpos.y = tpos.y-y+1
 				break
 			end

mods/MAPGEN/tsm_railcorridors/init.lua

@@ -154,16 +154,16 @@ local function SetNodeIfCanBuild(pos, node, check_above, can_replace_rail)
 		local abovename = minetest.get_node({x=pos.x,y=pos.y+1,z=pos.z}).name
 		local abovedef = minetest.registered_nodes[abovename]
 		if abovename == "unknown" or abovename == "ignore" or
-				(abovedef.groups and abovedef.groups.attached_node) or
+				(abovedef and abovedef.groups and abovedef.groups.attached_node) or
 				-- This is done because cobwebs are often fake liquids
-				(abovedef.liquidtype ~= "none" and abovename ~= tsm_railcorridors.nodes.cobweb) then
+				(abovedef and abovedef.liquidtype ~= "none" and abovename ~= tsm_railcorridors.nodes.cobweb) then
 			return false
 		end
 	end
 	local name = minetest.get_node(pos).name
 	local def = minetest.registered_nodes[name]
 	if name ~= "unknown" and name ~= "ignore" and
-			((def.is_ground_content and def.liquidtype == "none") or
+			((def and def.is_ground_content and def.liquidtype == "none") or
 			name == tsm_railcorridors.nodes.cobweb or
 			name == tsm_railcorridors.nodes.torch_wall or
 			name == tsm_railcorridors.nodes.torch_floor or
@@ -192,7 +192,7 @@ end
 local function IsGround(pos)
 	local nodename = minetest.get_node(pos).name
 	local nodedef = minetest.registered_nodes[nodename]
-	return nodename ~= "unknown" and nodename ~= "ignore" and nodedef.is_ground_content and nodedef.walkable and nodedef.liquidtype == "none"
+	return nodename ~= "unknown" and nodename ~= "ignore" and nodedef and nodedef.is_ground_content and nodedef.walkable and nodedef.liquidtype == "none"
 end
 
 -- Returns true if rails are allowed to be placed on top of this node
@@ -200,7 +200,7 @@ local function IsRailSurface(pos)
 	local nodename = minetest.get_node(pos).name
 	local nodename_above = minetest.get_node({x=pos.x,y=pos.y+2,z=pos.z}).name
 	local nodedef = minetest.registered_nodes[nodename]
-	return nodename ~= "unknown" and nodename ~= "ignore" and nodedef.walkable and (nodedef.node_box == nil or nodedef.node_box.type == "regular") and nodename_above ~= tsm_railcorridors.nodes.rail
+	return nodename ~= "unknown" and nodename ~= "ignore" and nodedef and nodedef.walkable and (nodedef.node_box == nil or nodedef.node_box.type == "regular") and nodename_above ~= tsm_railcorridors.nodes.rail
 end
 
 -- Checks if the node is empty space which requires to be filled by a platform
@@ -211,7 +211,7 @@ local function NeedsPlatform(pos)
 	local falling = minetest.get_item_group(node.name, "falling_node") == 1
 	return
 		-- Node can be replaced if ground content or rail
-		(node.name ~= "ignore" and node.name ~= "unknown" and nodedef.is_ground_content) and
+		(node.name ~= "ignore" and node.name ~= "unknown" and nodedef and nodedef.is_ground_content) and
 		-- Node needs platform if node below is not walkable.
 		-- Unless 2 nodes below there is dirt: This is a special case for the starter cube.
 		((nodedef.walkable == false and node2.name ~= tsm_railcorridors.nodes.dirt) or
@@ -253,7 +253,7 @@ local function Cube(p, radius, node, replace_air_only, wood, post)
 					if yi == y_top then
 						local topnode = minetest.get_node({x=xi,y=yi+1,z=zi})
 						local topdef = minetest.registered_nodes[topnode.name]
-						if minetest.get_item_group(topnode.name, "attached_node") ~= 1 and topdef.liquidtype == "none" then
+						if minetest.get_item_group(topnode.name, "attached_node") ~= 1 and topdef and topdef.liquidtype == "none" then
 							ok = true
 						end
 					elseif column_last_attached and yi == column_last_attached - 1 then
@@ -277,7 +277,7 @@ local function Cube(p, radius, node, replace_air_only, wood, post)
 						elseif wood and (xi == p.x or zi == p.z) and thisnode.name == wood then
 							local topnode = minetest.get_node({x=xi,y=yi+1,z=zi})
 							local topdef = minetest.registered_nodes[topnode.name]
-							if topdef.walkable and topnode.name ~= wood then
+							if topdef and topdef.walkable and topnode.name ~= wood then
 								minetest.set_node({x=xi,y=yi,z=zi}, node)
 								-- Check for torches around the wood and schedule them
 								-- for removal
@@ -429,7 +429,7 @@ local function TryPlaceCobweb(pos, needs_check, side_vector)
 			local cpos = vector.add(pos, check_vectors[c])
 			local cname = minetest.get_node(cpos).name
 			local cdef = minetest.registered_nodes[cname]
-			if cname ~= "ignore" and cdef.walkable then
+			if cname ~= "ignore" and cdef and cdef.walkable then
 				check_passed = true
 				break
 			end
@@ -523,12 +523,12 @@ local function WoodSupport(p, wood, post, torches, dir, torchdir)
 		local nodedef1 = minetest.registered_nodes[minetest.get_node(pos1).name]
 		local nodedef2 = minetest.registered_nodes[minetest.get_node(pos2).name]
 
-		if nodedef1.walkable then
+		if nodedef1 and nodedef1.walkable then
 			pos1.y = pos1.y + 1
 		end
 		SetNodeIfCanBuild(pos1, node, true)
 
-		if nodedef2.walkable then
+		if nodedef2 and nodedef2.walkable then
 			pos2.y = pos2.y + 1
 		end
 		SetNodeIfCanBuild(pos2, node, true)

mods/TODO.CORE

@@ -0,0 +1,16 @@
+CORE/_mcl_autogroup/init.lua:
+-> Enumerates entries of the registered_nodes table.  Safe.
+
+CORE/flowlib/init.lua:
+-> All instances are checked before use.
+
+CORE/mcl_explosions/init.lua:
+-> Enumerates entries of the registered_nodes table.  Safe.
+
+CORE/walkover/init.lua:
+-> Enumerates entries of the registered_nodes table.  Safe.
+
+CORE/mcl_util/init.lua:
+-> All instances are checked before use.
+- should use local.
+- defines mcl_util.call_on_rightclick, but does not use it.

mods/TODO.ENTITIES

@@ -0,0 +1,61 @@
+ENTITIES/mcl_boats/init.lua:
+-> All instances are checked before use.
+- one use in stray comment.
+- should use local or should use mcl_util.call_on_rightclick.
+
+ENTITIES/mcl_dripping/init.lua:
+-> Only references one directly indexed entry. Safe.
+
+ENTITIES/mcl_mobs/api.lua:
+-> Uses node_ok() that checks and always returns valid nodes. Safe.
+- line 1331 minetest.registered_items?  Fixed
+- should use locals.
+
+ENTITIES/mcl_mobs/spawning.lua:
+-> Only instances in commented out spawning code. Safe.
+
+ENTITIES/mcl_mobs/mount.lua:
+-> All instances shielded by node_ok(). Safe.
+
+ENTITIES/mobs_mc/snowman.lua:
+-> All instances checked.  Safe.
+- line 107 belowdef.nod_box == nil ?
+
+ENTITIES/mobs_mc/2_throwing.lua:
+-> All instances checked.  Safe.
+
+ENTITIES/mobs_mc/3_shared.lua:
+-> Unchecked accesses. Fixed.
+
+ENTITIES/mobs_mc/enderman.lua:
+-> Unchecked accesses. Fixed.
+- line 69: use indexed registered_nodes.
+- line 259: weird but works.
+- line 409 and onwards: restricted to takable_nodes.
+
+ENTITIES/mobs_mc/blaze.lua:
+-> Unchecked access. Fixed.
+
+ENTITIES/mobs_mc/slime+magma_cube.lua:
+-> Unchecked accesses. Fixed.
+
+ENTITIES/mobs_mc/5_spawn_abm_check.lua:
+-> Does not appear to be used at all.
+- unchecked access.  Unfixed.
+
+ENTITIES/mcl_paintings/init.lua:
+-> All instances checked.  Safe.
+
+ENTITIES/mcl_item_entity/init.lua:
+-> Unchecked access.  Fixed.
+
+ENTITIES/mcl_falling_nodes/init.lua:
+-> All instances checked.  Safe.
+- line 170: minetest.registered_nodes[self.node.name] is the same as bcd set on line 155
+  because of condition on line 164, therefore this access is safe.  Sloppy code though.
+
+ENTITIES/mcl_minecarts/init.lua:
+-> Unchecked access.  Fixed.
+
+ENTITIES/mobs_mc_gameconfig/init.lua:
+-> Only explicit indexing of registered_nodes. Safe

mods/TODO.ITEMS

@@ -0,0 +1,156 @@
+ITEMS/mcl_portals/portal_nether.lua
+-> not checked.
+ITEMS/mcl_portals/portal_gateway.lua
+-> not checked.
+ITEMS/mcl_portals/portal_end.lua
+-> not checked.
+ITEMS/mcl_sponges/init.lua
+-> not checked.
+ITEMS/mcl_beds/api.lua
+-> not checked.
+ITEMS/mcl_beds/functions.lua
+-> not checked.
+ITEMS/mcl_torches/api.lua
+-> not checked.
+ITEMS/mcl_tools/init.lua
+-> not checked.
+ITEMS/mcl_ocean/seagrass.lua
+-> not checked.
+ITEMS/mcl_ocean/kelp.lua
+-> not checked.
+ITEMS/mcl_ocean/corals.lua
+-> not checked.
+ITEMS/mcl_ocean/sea_pickle.lua
+-> not checked.
+ITEMS/mcl_lanterns/init.lua
+-> not checked.
+ITEMS/mcl_stairs/api.lua
+-> not checked.
+ITEMS/mcl_stairs/cornerstair.lua
+-> not checked.
+ITEMS/mcl_dye/init.lua
+-> not checked.
+ITEMS/mcl_bows/crossbow.lua
+-> not checked.
+ITEMS/mcl_bows/bow.lua
+-> not checked.
+ITEMS/mcl_bows/rocket.lua
+-> not checked.
+ITEMS/mcl_bows/arrow.lua
+-> not checked.
+ITEMS/mcl_buckets/init.lua
+-> not checked.
+ITEMS/mcl_buckets/register.lua
+-> not checked.
+ITEMS/mcl_throwing/register.lua
+-> not checked.
+ITEMS/mcl_flowers/init.lua
+-> not checked.
+ITEMS/mcl_tnt/init.lua
+-> not checked.
+ITEMS/mcl_cocoas/init.lua
+-> not checked.
+ITEMS/xpanes/init.lua
+-> not checked.
+ITEMS/mcl_potions/tipped_arrow.lua
+-> not checked.
+ITEMS/mcl_potions/potions.lua
+-> not checked.
+ITEMS/mcl_potions/init.lua
+-> not checked.
+ITEMS/mcl_end/end_crystal.lua
+-> not checked.
+ITEMS/mcl_end/chorus_plant.lua
+-> not checked.
+ITEMS/mcl_walls/init.lua
+-> not checked.
+ITEMS/mcl_fishing/init.lua
+-> not checked.
+ITEMS/mcl_composters/init.lua
+-> not checked.
+ITEMS/mcl_heads/init.lua
+-> not checked.
+ITEMS/mclx_fences/init.lua
+-> not checked.
+ITEMS/mcl_mobspawners/init.lua
+-> not checked.
+ITEMS/mclx_stairs/init.lua
+-> not checked.
+ITEMS/mclx_core/init.lua
+-> not checked.
+ITEMS/mcl_core/nodes_base.lua
+-> not checked.
+ITEMS/mcl_core/nodes_misc.lua
+-> not checked.
+ITEMS/mcl_core/nodes_cactuscane.lua
+-> not checked.
+ITEMS/mcl_core/nodes_climb.lua
+-> not checked.
+ITEMS/mcl_core/craftitems.lua
+-> not checked.
+
+ITEMS/mcl_core/functions.lua
+-> Unchecked accesses.  Fixed.
+
+ITEMS/mcl_fire/init.lua
+-> not checked.
+ITEMS/mcl_fire/fire_charge.lua
+-> not checked.
+ITEMS/mcl_fire/flint_and_steel.lua
+-> not checked.
+ITEMS/mcl_banners/init.lua
+-> not checked.
+ITEMS/mcl_farming/shared_functions.lua
+-> not checked.
+ITEMS/mcl_farming/hoes.lua
+-> not checked.
+ITEMS/mcl_farming/soil.lua
+-> not checked.
+ITEMS/mcl_signs/init.lua
+-> not checked.
+ITEMS/mcl_maps/init.lua
+-> not checked.
+ITEMS/screwdriver/init.lua
+-> not checked.
+ITEMS/mcl_nether/lava.lua
+-> not checked.
+ITEMS/mcl_nether/nether_wart.lua
+-> not checked.
+ITEMS/mcl_books/init.lua
+-> not checked.
+ITEMS/mcl_chests/init.lua
+-> not checked.
+ITEMS/mcl_hoppers/init.lua
+-> not checked.
+ITEMS/mcl_colorblocks/init.lua
+-> not checked.
+ITEMS/REDSTONE/mcl_dispensers/init.lua
+-> not checked.
+ITEMS/REDSTONE/mcl_droppers/init_new.lua
+-> not checked.
+ITEMS/REDSTONE/mcl_droppers/init.lua
+-> not checked.
+ITEMS/REDSTONE/mcl_comparators/init.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons_pressureplates/init.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons_walllever/init.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons_button/init.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons/internal.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons/util.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons_mvps/init.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons_wires/init.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons_delayer/init.lua
+-> not checked.
+ITEMS/REDSTONE/mesecons_pistons/init.lua
+-> not checked.
+ITEMS/mcl_itemframes/init.lua
+-> not checked.
+ITEMS/mcl_doors/api_doors.lua
+-> not checked.

mods/TODO.MAPGEN

@@ -0,0 +1,17 @@
+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.