pub unsafe extern "C" fn gtk_icon_info_load_symbolic_async(
icon_info: *mut GtkIconInfo,
fg: *const GdkRGBA,
success_color: *const GdkRGBA,
warning_color: *const GdkRGBA,
error_color: *const GdkRGBA,
cancellable: *mut GCancellable,
callback: GAsyncReadyCallback,
user_data: gpointer
)