Get rid of recursive call in default.dig_up

game.conf

@@ -1,4 +1,4 @@
 title       = Minetest Game
 author      = Minetest
 description = A basic exploration, mining, crafting, and building, sandbox game with no NPCs, monsters, or animals. Minetest Game is usually used with mods added, and many mods are available for this game. Reliably maintained by Minetest Engine core developers.
-min_minetest_version = 5.8
+min_minetest_version = 5.9

mods/default/functions.lua

@@ -293,12 +293,25 @@ minetest.register_abm({
 -- Dig upwards
 --
 
-function default.dig_up(pos, node, digger)
+local in_dig_up = false
+function default.dig_up(pos, node, digger, max_height)
+	if in_dig_up then return end -- Do not recurse
 	if digger == nil then return end
-	local np = {x = pos.x, y = pos.y + 1, z = pos.z}
-	local nn = minetest.get_node(np)
-	if nn.name == node.name then
-		minetest.node_dig(np, nn, digger)
+	max_height = max_height or 100
+
+	for y = pos.y + 1, pos.y + max_height do
+		local up_pos  = vector.new(pos.x, y, pos.z)
+		local up_node = minetest.get_node(up_pos)
+		if up_node.name == node.name then
+			in_dig_up = true
+			if not minetest.dig_node(up_pos, digger) then
+				in_dig_up = false
+				break
+			end
+			in_dig_up = false
+		else
+			break
+		end
 	end
 end
 

mods/default/init.lua

@@ -17,7 +17,7 @@ default.get_translator = S
 -- and avoids obscure, hard to debug runtime errors.
 -- This section should be updated before release and older checks can be dropped
 -- when newer ones are introduced.
-if ItemStack("").add_wear_by_uses == nil then
+if not minetest.features.node_interaction_actor then
 	error("\nThis version of Minetest Game is incompatible with your engine version "..
 		"(which is too old). You should download a version of Minetest Game that "..
 		"matches the installed engine version.\n")