diff options
| -rw-r--r-- | util/set.lua | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/util/set.lua b/util/set.lua index 050446ec..7f45526e 100644 --- a/util/set.lua +++ b/util/set.lua @@ -26,8 +26,9 @@ function set_mt.__div(set, func) local new_set, new_items = _M.new(); local items, new_items = set._items, new_set._items; for item in pairs(items) do - if func(item) then - new_items[item] = true; + local new_item = func(item); + if new_item ~= nil then + new_items[new_item] = true; end end return new_set; |