gistfile1.lua

player:set_inventory_formspec("size[13,7.5]"..
		--"image[6,0.6;1,2;player.png]"..
		"list[current_player;main;5,3.5;8,4;]"..
		"list[current_player;craft;8,0;3,3;]"..
		"list[current_player;craftpreview;12,1;1,1;]"..
		"list[detached:creative;main;0.3,0.5;4,6;"..tostring(start_i).."]"..
		"label[2.0,6.55;"..tostring(pagenum).."/"..tostring(pagemax).."]"..
		"button[0.3,6.5;1.6,1;creative_prev;<<]"..
		"button[2.7,6.5;1.6,1;creative_next;>>]"..
		"label[6,1.5;Trash:]"..
		"list[detached:trash;main;6,2;1,1;]")

-- and

local trash = minetest.create_detached_inventory("trash", {
	allow_put = function(inv, listname, index, stack, player)
		return -1
	end,
})
trash:set_size("main", 1)