Function userfunc_collectgarbage

crawl-ref/source/macro.cc:173–180

Expensive function to discard unused function names

// Expensive function to discard unused function names
static void userfunc_collectgarbage()
{
    for (int i = userfunctions.size() - 1; i >= 0; --i)
    {
        if (!userfunctions.empty() && !userfunc_referenced(i))
            userfunctions[i].clear();
    }
}

static int userfunc_getindex(const string &fname)
{