Function lua_setwarnf

extlibs/lua/src/lapi.c:1282–1287

void lua_setwarnf (lua_State *L, lua_WarnFunction f, void *ud) {
  lua_lock(L);
  G(L)->ud_warn = ud;
  G(L)->warnf = f;
  lua_unlock(L);
}


void lua_warning (lua_State *L, const char *msg, int tocont) {