code: func (v *Entry) GetIconStock(iconPos EntryIconPosition) (string, error) {
  	c := C.gtk_entry_get_icon_stock(v.native(),
  		C.GtkEntryIconPosition(iconPos))
  	if c == nil {
  		return "", nilPtrErr
  	}
  	return C.GoString((*C.char)(c)), nil
  }
docs: // GetIconStock is a wrapper around gtk_entry_get_icon_stock().