Function luaL_unref

3rd/lua-5.4.3/src/lauxlib.c:688–697

LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
  if (ref >= 0) {
    t = lua_absindex(L, t);
    lua_rawgeti(L, t, freelist);
    lua_assert(lua_isinteger(L, -1));
    lua_rawseti(L, t, ref);  /* t[ref] = t[freelist] */
    lua_pushinteger(L, ref);
    lua_rawseti(L, t, freelist);  /* t[freelist] = ref */
  }
}

/* }====================================================== */