luaL_checkoption   71 lib/lua/lauxlib.h LUALIB_API int (luaL_checkoption) (lua_State *L, int narg, const char *def,
luaL_checkoption  231 lib/lua/lbaselib.c   int o = luaL_checkoption(L, 1, "collect", opts);
luaL_checkoption  516 lib/lua/liolib.c   int op = luaL_checkoption(L, 2, "cur", modenames);
luaL_checkoption  533 lib/lua/liolib.c   int op = luaL_checkoption(L, 2, NULL, modenames);
luaL_checkoption  234 lib/lua/loslib.c   int op = luaL_checkoption(L, 2, "all", catnames);