code: func IconThemeGetForScreen(screen gdk.Screen) (*IconTheme, error) {
  	cScreen := (*C.GdkScreen)(unsafe.Pointer(screen.Native()))
  	c := C.gtk_icon_theme_get_for_screen(cScreen)
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return &IconTheme{c}, nil
  }
docs: // IconThemeGetForScreen is a wrapper around gtk_icon_theme_get_for_screen().