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-rw-r--r--util/set.lua5
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;