code: func CheckButtonNewWithMnemonic(label string) (*CheckButton, error) {
  	cstr := C.CString(label)
  	defer C.free(unsafe.Pointer(cstr))
  	c := C.gtk_check_button_new_with_mnemonic((*C.gchar)(cstr))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	obj := glib.Take(unsafe.Pointer(c))
  	return wrapCheckButton(obj), nil
  }
docs: // CheckButtonNewWithMnemonic is a wrapper around
  // gtk_check_button_new_with_mnemonic().