[HELP] Book: Ch. 5.4 Properties - #[derived_properties] Requires glib-macros

[cornmonger]

In Chapter 5.4: Adding Properties to Custom GObjects, the example makes use of the derived_properties macro:

// [...]
use glib::Properties;
use gtk::glib;
use gtk::prelude::*;
use gtk::subclass::prelude::*;

// [...]

#[glib::derived_properties]
impl ObjectImpl for CustomButton {

The macro call doesn't resolve for me if I simply follow the instructions in Chapter 2: Project Setup. I have to manually cargo add glib-macros and then alter the example with:

// [...]
use glib_macros;

// [...]

// Trait shared by all GObjects
#[glib_macros::derived_properties]
impl ObjectImpl for CustomButton {

After that everything compiles and runs properly.

I'm I doing something wrong or is this a documentation problem?
Thanks!

[bilelmoussaoui]

See #1435

[cornmonger]

Thanks. That answers another problem I ran into later as well.