luaL_callmeta      47 lib/lua/lauxlib.h LUALIB_API int (luaL_callmeta) (lua_State *L, int obj, const char *e);
luaL_callmeta     431 lib/lua/lbaselib.c   if (luaL_callmeta(L, 1, "__tostring"))  /* is there a metafield? */