lua_pushlightuserdata
LUA_API void (lua_pushlightuserdata) (lua_State *L, void *p);
lua_pushlightuserdata(L,(u)), \
lua_pushlightuserdata(state, (char *)key);
lua_pushlightuserdata(state, nvl);
lua_pushlightuserdata(state, ri);
lua_pushlightuserdata(state, pair);
lua_pushlightuserdata(state, NULL);
lua_pushlightuserdata(state, info);
lua_pushlightuserdata(state, info);