code: func (v *CssProvider) LoadFromPath(path string) error {
  	cpath := C.CString(path)
  	defer C.free(unsafe.Pointer(cpath))
  	var gerr *C.GError
  	if C.gtk_css_provider_load_from_path(v.native(), (*C.gchar)(cpath), &gerr) == 0 {
  		defer C.g_error_free(gerr)
  		return errors.New(goString(gerr.message))
  	}
  	return nil
  }
docs: // LoadFromPath is a wrapper around gtk_css_provider_load_from_path().